廣東超聲焊接換能器廠家
超(chao)(chao)(chao)聲(sheng)振動(dong)(dong)(dong)切(qie)(qie)削(xue)(xue)(xue)技術(shu)長春汽車工業高等專科(ke)學校采(cai)(cai)用(yong)超(chao)(chao)(chao)聲(sheng)振動(dong)(dong)(dong)切(qie)(qie)削(xue)(xue)(xue)方(fang)(fang)法(fa)對(dui)一汽變速箱廠(chang)生(sheng)產(chan)的(de)一直齒齒輪的(de)滾齒加工進(jin)行了(le)工藝(yi)實驗(yan),通(tong)過生(sheng)產(chan)現(xian)場各(ge)種工藝(yi)參數(shu)實驗(yan)及小(xiao)批量(liang)試生(sheng)產(chan),收(shou)到(dao)了(le)令人(ren)滿意的(de)效(xiao)果,具有較好(hao)的(de)發(fa)展前景。北京裝甲兵技術(shu)學院(yuan)提出了(le)一種超(chao)(chao)(chao)聲(sheng)微(wei)振車削(xue)(xue)(xue)的(de)新工藝(yi)。其(qi)特(te)點(dian)是(shi)功率(lv)小(xiao)(50W)、振幅(fu)小(xiao)(2~5μm),同(tong)樣可獲得一般振動(dong)(dong)(dong)車削(xue)(xue)(xue)的(de)效(xiao)果。超(chao)(chao)(chao)聲(sheng)振動(dong)(dong)(dong)切(qie)(qie)削(xue)(xue)(xue)的(de)應用(yong)也日趨,對(dui)其(qi)的(de)研(yan)究主要應從(cong)幾個方(fang)(fang)面進(jin)行:(1)研(yan)制和(he)采(cai)(cai)用(yong)新的(de)刀具材料(liao);(2)研(yan)制和(he)采(cai)(cai)用(yong)高效(xiao)的(de)振動(dong)(dong)(dong)切(qie)(qie)削(xue)(xue)(xue)系統;(3)對(dui)振動(dong)(dong)(dong)切(qie)(qie)削(xue)(xue)(xue)機理深(shen)入(ru)研(yan)究;(4)超(chao)(chao)(chao)聲(sheng)橢圓(yuan)振動(dong)(dong)(dong)切(qie)(qie)削(xue)(xue)(xue)的(de)研(yan)究與推廣(guang);(5)超(chao)(chao)(chao)聲(sheng)銑削(xue)(xue)(xue)加工技術(shu)。Cymbal陣列接(jie)收(shou)器位于(yu)圓(yuan)盤式壓電換能器之上(shang),作為超(chao)(chao)(chao)聲(sheng)波接(jie)收(shou)器。廣(guang)東超(chao)(chao)(chao)聲(sheng)焊接(jie)換能器廠(chang)家
數(shu)控超聲(sheng)(sheng)(sheng)加(jia)(jia)(jia)(jia)工(gong)(gong)當(dang)前,制(zhi)造(zao)業現代化水平不(bu)(bu)(bu)斷提(ti)(ti)高(gao),機(ji)床(chuang)(chuang)(chuang)向數(shu)控方向不(bu)(bu)(bu)斷發展(zhan),而(er)我國制(zhi)造(zao)行(xing)業和企(qi)業的生產加(jia)(jia)(jia)(jia)工(gong)(gong)裝備絕大多(duo)數(shu)仍是傳統(tong)的機(ji)床(chuang)(chuang)(chuang),比如車床(chuang)(chuang)(chuang)、銑床(chuang)(chuang)(chuang)、磨(mo)床(chuang)(chuang)(chuang)、鉆床(chuang)(chuang)(chuang)、鏜床(chuang)(chuang)(chuang)等(deng),其刀具相對工(gong)(gong)件(jian)作(zuo)直線運(yun)動,使(shi)得其加(jia)(jia)(jia)(jia)工(gong)(gong)精度(du)(du)遠遠不(bu)(bu)(bu)能滿(man)足需求(qiu),直接(jie)影(ying)響企(qi)業的生存和發展(zhan)。將超聲(sheng)(sheng)(sheng)加(jia)(jia)(jia)(jia)工(gong)(gong)技(ji)術應用到數(shu)控機(ji)床(chuang)(chuang)(chuang)上,使(shi)得刀具相對工(gong)(gong)件(jian)作(zuo)不(bu)(bu)(bu)規則運(yun)動,使(shi)工(gong)(gong)件(jian)精度(du)(du)得以(yi)進一步提(ti)(ti)高(gao),超聲(sheng)(sheng)(sheng)加(jia)(jia)(jia)(jia)工(gong)(gong)不(bu)(bu)(bu)僅(jin)是克(ke)服了(le)一些特殊材料不(bu)(bu)(bu)易被加(jia)(jia)(jia)(jia)工(gong)(gong)的缺點,而(er)且還提(ti)(ti)高(gao)了(le)加(jia)(jia)(jia)(jia)工(gong)(gong)精度(du)(du),縮短(duan)了(le)加(jia)(jia)(jia)(jia)工(gong)(gong)時(shi)長(chang),提(ti)(ti)高(gao)了(le)效率(lv)。而(er)且它(ta)在切削、磨(mo)削、光整加(jia)(jia)(jia)(jia)工(gong)(gong)中的地(di)位是不(bu)(bu)(bu)可替(ti)代的。深圳超聲(sheng)(sheng)(sheng)波(bo)霧化換能器廠家超聲(sheng)(sheng)(sheng)波(bo)變幅桿(gan)按照振(zhen)(zhen)動類型,可分為縱(zong)振(zhen)(zhen)、扭(niu)(niu)振(zhen)(zhen)、彎振(zhen)(zhen)以(yi)及(ji)復合振(zhen)(zhen)動(縱(zong)彎、縱(zong)扭(niu)(niu)、彎扭(niu)(niu)),四類。
超(chao)聲波靶(ba)(ba)材焊(han)(han)(han)接(jie)(jie)超(chao)聲波靶(ba)(ba)材焊(han)(han)(han)接(jie)(jie)機(ji)用(yong)于(yu)不使用(yong)助焊(han)(han)(han)劑(ji)(ji)的(de)各(ge)種靶(ba)(ba)如ITO、Al、Mo、Cr、Si等的(de)銦涂(tu)層(ceng)和背板。超(chao)聲波靶(ba)(ba)材焊(han)(han)(han)接(jie)(jie)機(ji)可用(yong)于(yu)平面、內(nei)圓、外圓靶(ba)(ba)的(de)表(biao)面涂(tu)層(ceng)。超(chao)聲波焊(han)(han)(han)接(jie)(jie)機(ji)提供(gong)了(le)一種不使用(yong)助焊(han)(han)(han)劑(ji)(ji)的(de)環保型焊(han)(han)(han)接(jie)(jie)解決方案,并且從根(gen)本上(shang)避免了(le)常規助焊(han)(han)(han)劑(ji)(ji)焊(han)(han)(han)接(jie)(jie)的(de)各(ge)種問題,從而(er)提供(gong)了(le)穩定(ding)可靠的(de)焊(han)(han)(han)接(jie)(jie)。超(chao)聲波金屬熔液(ye)處理超(chao)聲波焊(han)(han)(han)接(jie)(jie)是一種無(wu)助焊(han)(han)(han)劑(ji)(ji)連接(jie)(jie)方法,其中高頻機(ji)械振(zhen)動代替了(le)助焊(han)(han)(han)劑(ji)(ji)。機(ji)械振(zhen)動被傳遞到液(ye)態(tai)焊(han)(han)(han)料浴(yu),并且機(ji)械振(zhen)動的(de)能量導致發生氣蝕,從而(er)侵蝕了(le)浸入浴(yu)中的(de)零件的(de)表(biao)面。這樣可以(yi)去除零件表(biao)面的(de)氧(yang)化(hua)層(ceng),并使熔化(hua)的(de)焊(han)(han)(han)料潤(run)濕干(gan)凈的(de)金屬表(biao)面
1927年(nian),美(mei)國(guo)(guo)物理(li)學家伍德和(he)盧米斯早(zao)作(zuo)了(le)超(chao)(chao)聲(sheng)(sheng)加(jia)工(gong)(gong)(gong)(gong)(gong)試驗,利用強烈(lie)的(de)(de)超(chao)(chao)聲(sheng)(sheng)振(zhen)動(dong)對玻璃板進(jin)行雕刻和(he)快速鉆孔,但當時并未(wei)應用在工(gong)(gong)(gong)(gong)(gong)業上;1951年(nian),美(mei)國(guo)(guo)的(de)(de)科恩制(zhi)成臺實用的(de)(de)超(chao)(chao)聲(sheng)(sheng)加(jia)工(gong)(gong)(gong)(gong)(gong)機(ji)。二十世(shi)紀50年(nian)代(dai)中期,日本、蘇聯將超(chao)(chao)聲(sheng)(sheng)加(jia)工(gong)(gong)(gong)(gong)(gong)與電(dian)(dian)加(jia)工(gong)(gong)(gong)(gong)(gong)(如電(dian)(dian)火花(hua)加(jia)工(gong)(gong)(gong)(gong)(gong)和(he)電(dian)(dian)解(jie)加(jia)工(gong)(gong)(gong)(gong)(gong)等)、切削(xue)加(jia)工(gong)(gong)(gong)(gong)(gong)結(jie)合(he)起來,開辟了(le)復(fu)合(he)加(jia)工(gong)(gong)(gong)(gong)(gong)的(de)(de)領域。這種(zhong)復(fu)合(he)加(jia)工(gong)(gong)(gong)(gong)(gong)的(de)(de)方法能(neng)(neng)改(gai)善電(dian)(dian)加(jia)工(gong)(gong)(gong)(gong)(gong)或金(jin)屬切削(xue)加(jia)工(gong)(gong)(gong)(gong)(gong)的(de)(de)條(tiao)件,提高加(jia)工(gong)(gong)(gong)(gong)(gong)效率(lv)和(he)質量。1964年(nian),英國(guo)(guo)又(you)提出使用燒結(jie)或電(dian)(dian)鍍金(jin)剛石(shi)工(gong)(gong)(gong)(gong)(gong)具的(de)(de)超(chao)(chao)聲(sheng)(sheng)旋轉加(jia)工(gong)(gong)(gong)(gong)(gong)的(de)(de)方法,克服了(le)一般(ban)超(chao)(chao)聲(sheng)(sheng)加(jia)工(gong)(gong)(gong)(gong)(gong)深孔時,加(jia)工(gong)(gong)(gong)(gong)(gong)速度(du)低和(he)精度(du)差的(de)(de)缺點。超(chao)(chao)聲(sheng)(sheng)波(bo)變幅桿(超(chao)(chao)聲(sheng)(sheng)波(bo)變幅器)顧名(ming)思義就是配(pei)合(he)超(chao)(chao)聲(sheng)(sheng)波(bo)換能(neng)(neng)器改(gai)變超(chao)(chao)聲(sheng)(sheng)波(bo)振(zhen)動(dong)幅度(du)的(de)(de)功能(neng)(neng)組件。
在(zai)這種(zhong)被稱為(wei)“空化(hua)”效(xiao)應的(de)過程(cheng)中,氣(qi)泡(pao)閉合可形成超過1000大氣(qi)壓(ya)的(de)瞬間高(gao)壓(ya),連續(xu)不(bu)斷(duan)地(di)產(chan)生瞬間高(gao)壓(ya)就象一(yi)(yi)連串小“”不(bu)斷(duan)地(di)沖(chong)擊物(wu)(wu)件(jian)(jian)(jian)表(biao)(biao)面(mian),使物(wu)(wu)件(jian)(jian)(jian)的(de)表(biao)(biao)面(mian)及(ji)縫(feng)隙中的(de)污垢迅速剝落,從而達到物(wu)(wu)件(jian)(jian)(jian)表(biao)(biao)面(mian)凈(jing)化(hua)的(de)目的(de)。相比其他多種(zhong)的(de)清洗方式,超聲波清洗具有:清洗效(xiao)果(guo)好,清潔度(du)高(gao)且全部工件(jian)(jian)(jian)清潔度(du)一(yi)(yi)致;清洗速度(du)快,提高(gao)生產(chan)效(xiao)率,不(bu)須人(ren)手接觸清洗液,安(an)全可靠(kao);對(dui)(dui)深孔(kong)、細縫(feng)和(he)工件(jian)(jian)(jian)隱(yin)蔽(bi)處亦(yi)可清洗干凈(jing);對(dui)(dui)工件(jian)(jian)(jian)表(biao)(biao)面(mian)無損傷,節省溶劑、工作場地(di)和(he)人(ren)工等優點。在(zai)功率超聲的(de)加(jia)工和(he)處理應用(yong)中,縱振型應用(yong)為(wei)普遍。東莞(guan)雄克換能器非標定制
其特征(zheng)在于它還包括Cymbal陣列接收器(qi),它由引出(chu)電(dian)纜、8~16只Cymbal換(huan)能(neng)器(qi)、金屬圓環、和橡膠墊圈組成。廣東超(chao)聲(sheng)焊接換(huan)能(neng)器(qi)廠(chang)家
超(chao)聲(sheng)(sheng)波(bo)加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)是利用(yong)超(chao)聲(sheng)(sheng)頻作小(xiao)振幅振動(dong)的(de)(de)(de)工(gong)(gong)具,并通過它與(yu)工(gong)(gong)件之間游離(li)于液體(ti)中的(de)(de)(de)磨料對(dui)被(bei)加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)表面的(de)(de)(de)捶擊作用(yong),使工(gong)(gong)件材料表面逐步(bu)破(po)碎的(de)(de)(de)特(te)種(zhong)加(jia)(jia)(jia)(jia)(jia)工(gong)(gong),英文簡稱為USM。超(chao)聲(sheng)(sheng)加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)常用(yong)于穿孔(kong)、切(qie)割、焊接(jie)、套(tao)料和拋光。超(chao)聲(sheng)(sheng)波(bo)隨著技(ji)術(shu)的(de)(de)(de)發展(zhan)越來越為人們所(suo)應用(yong),他通過自身(shen)的(de)(de)(de)一(yi)些特(te)性一(yi)步(bu)步(bu)奠定自己在(zai)切(qie)削、拉絲模、深小(xiao)孔(kong)加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)等的(de)(de)(de)地位。超(chao)聲(sheng)(sheng)加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)在(zai)幾十(shi)年里的(de)(de)(de)到了(le)(le)迅猛(meng)發展(zhan),尤其(qi)是在(zai)難加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)材料領域(yu)解決(jue)了(le)(le)很多關鍵(jian)的(de)(de)(de)工(gong)(gong)藝問(wen)題,取得了(le)(le)良好的(de)(de)(de)效果。難加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)材料促(cu)進(jin)了(le)(le)超(chao)聲(sheng)(sheng)加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)技(ji)術(shu)的(de)(de)(de)發展(zhan),從而進(jin)一(yi)步(bu)促(cu)進(jin)了(le)(le)新材料的(de)(de)(de)發展(zhan),可以預測,超(chao)聲(sheng)(sheng)加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)技(ji)術(shu)的(de)(de)(de)應用(yong)將會越來越。廣(guang)東(dong)超(chao)聲(sheng)(sheng)焊接(jie)換能器(qi)廠(chang)家
杭(hang)(hang)州(zhou)速(su)杭(hang)(hang)超(chao)(chao)(chao)(chao)聲波(bo)(bo)科(ke)技有(you)限公(gong)(gong)(gong)司主營品牌有(you)杭(hang)(hang)州(zhou)速(su)杭(hang)(hang)超(chao)(chao)(chao)(chao)聲,發展規模團隊(dui)不斷壯大,該公(gong)(gong)(gong)司生產(chan)型的公(gong)(gong)(gong)司。杭(hang)(hang)州(zhou)速(su)杭(hang)(hang)超(chao)(chao)(chao)(chao)聲是一(yi)家(jia)私營獨資企(qi)業(ye)企(qi)業(ye),一(yi)直“以人為本,服務于社會”的經營理念(nian);“誠(cheng)守信譽,持(chi)續發展”的質量方(fang)針。以滿足顧客(ke)(ke)要求為己任;以顧客(ke)(ke)永(yong)遠滿意為標準;以保持(chi)行業(ye)優先(xian)為目標,提供的超(chao)(chao)(chao)(chao)聲波(bo)(bo)換能器,超(chao)(chao)(chao)(chao)聲波(bo)(bo)聲化學設(she)備(bei),超(chao)(chao)(chao)(chao)聲波(bo)(bo)焊(han)接機(ji),超(chao)(chao)(chao)(chao)聲波(bo)(bo)埋(mai)線器。杭(hang)(hang)州(zhou)速(su)杭(hang)(hang)超(chao)(chao)(chao)(chao)聲順應時代(dai)發展和(he)市場需(xu)求,通過技術,力圖保證高規格(ge)高質量的超(chao)(chao)(chao)(chao)聲波(bo)(bo)換能器,超(chao)(chao)(chao)(chao)聲波(bo)(bo)聲化學設(she)備(bei),超(chao)(chao)(chao)(chao)聲波(bo)(bo)焊(han)接機(ji),超(chao)(chao)(chao)(chao)聲波(bo)(bo)埋(mai)線器。
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高溫偶聯劑什么價位
偶(ou)聯劑(ji)普遍用(yong)于(yu)橡膠、塑(su)料(liao)、膠黏劑(ji)、密封劑(ji)、涂料(liao)、玻璃、陶瓷(ci)、金(jin)屬防腐等領域(yu)。偶(ou)聯劑(ji)作(zuo)表面改(gai)性劑(ji),用(yong)于(yu)無機(ji)填料(liao)填充塑(su)料(liao)時(shi),可以改(gai)善(shan)其分散性和黏合(he)性。偶(ou)聯劑(ji)是一種具(ju)有(you)特殊結(jie)構的有(you)機(ji)硅化合(he)物(wu),硅烷偶(ou)聯劑(ji)已成 。
塑(su)膠桶廠家:主動能(neng)夠讓(rang)客(ke)戶更認同主動服務(wu)是一(yi)種積極(ji)(ji)的(de)態度,積極(ji)(ji)是一(yi)個人進(jin)取的(de)體現(xian),積極(ji)(ji)也是所(suo)有塑(su)料桶廠家都建議的(de)一(yi)種工(gong)作作風。只有積極(ji)(ji)的(de)行動才能(neng)夠產(chan)生積極(ji)(ji)的(de)結果,我們(men)在做(zuo)一(yi)件事宜的(de)時(shi)刻,成功與否,往往 。
加(jia)熱(re)(re)(re)片(pian)的(de)(de)導(dao)(dao)熱(re)(re)(re)系(xi)數具有(you)可(ke)調(diao)控性(xing),導(dao)(dao)熱(re)(re)(re)穩定度也更好;由(you)于空(kong)(kong)氣(qi)是熱(re)(re)(re)的(de)(de)不良導(dao)(dao)體,會嚴重阻礙熱(re)(re)(re)量在接觸面(mian)(mian)之(zhi)間的(de)(de)傳遞,而在發熱(re)(re)(re)源和散(san)熱(re)(re)(re)器之(zhi)間加(jia)裝(zhuang)加(jia)熱(re)(re)(re)片(pian)可(ke)以將空(kong)(kong)氣(qi)擠出接觸面(mian)(mian);有(you)了加(jia)熱(re)(re)(re)片(pian)的(de)(de)補充,可(ke)以使發熱(re)(re)(re)源和散(san)熱(re)(re)(re)器之(zhi) 。
風電灌(guan)漿料(liao)灌(guan)漿開始(shi)前24小(xiao)時,需保持(chi)表面濕潤,灌(guan)漿開始(shi)前1小(xiao)時,清理(li)表面積(ji)水(shui)。上(shang)錨板調平;上(shang)錨板水(shui)平度灌(guan)漿前不大(da)于(yu)1.5mm,灌(guan)漿后不大(da)于(yu)2mm。由于(yu)灌(guan)漿完成后漿料(liao)將與上(shang)錨板和錨栓緊密(mi)貼合(he),上(shang)強(qiang)度后均 。
產品型(xing)號RER-USB500W04AF-V60感光片OV5640(1/4”)有效像素2592(H)1944(V)Sensitivity600mV/Lux-secPixelSize1.4μmx1.4μm 。
在垃圾液壓抓(zhua)斗(dou)使用(yong)過程中,常(chang)常(chang)會遇到各(ge)(ge)種各(ge)(ge)樣的問(wen)題,除了垃圾抓(zhua)斗(dou)本(ben)身(shen)所使用(yong)的環境比較惡(e)劣之外,其余大(da)部分都是(shi)閥組(zu)的自身(shen)設計缺陷而(er)導(dao)致的,例如,抓(zhua)斗(dou)開合速度慢,這(zhe)就是(shi)閥組(zu)本(ben)身(shen)設計不合理導(dao)致的,這(zhe)個故(gu)障(zhang)率 。
氣(qi)囊(nang)式膨脹(zhang)罐(guan)的(de)優點首先在(zai)于工(gong)作介質只進入氣(qi)囊(nang)內不與(yu)罐(guan)體內壁接觸(chu)而避免生銹,膨脹(zhang)罐(guan)在(zai)工(gong)作中有損壞亦(yi)是氣(qi)囊(nang),直接更換(huan)新(xin)氣(qi)囊(nang)后又可(ke)正常工(gong)作。那如何更換(huan)氣(qi)囊(nang)呢?首先卸下膨脹(zhang)罐(guan)頂部(bu)的(de)黑色防塵塑(su)料尾蓋(gai),用放氣(qi)針頂 。
在(zai)線防(fang)爆氧分析儀(yi)系統的氧傳感(gan)器(qi)的日常維護(hu)中,帶加(jia)熱控制取樣檢測(ce)(ce)的氧探頭(tou)只有在(zai)氧傳感(gan)器(qi)與加(jia)熱控制連接后才能正常工作,并(bing)在(zai)冷態下(xia)輸出(chu)隨機信號。無論(lun)如(ru)何,在(zai)氧傳感(gan)器(qi)與加(jia)熱控制器(qi)連接后,正常的氣體檢測(ce)(ce)可以在(zai)室(shi) 。
噴(pen)(pen)涂(tu)(tu)式點(dian)膠(jiao)機(ji)應用普遍的(de)(de)原因是什么?噴(pen)(pen)涂(tu)(tu)式點(dian)膠(jiao)機(ji)應用普遍的(de)(de)原因有以(yi)下(xia)幾點(dian):1. 高效生(sheng)產(chan):噴(pen)(pen)涂(tu)(tu)式點(dian)膠(jiao)機(ji)可(ke)以(yi)快速地噴(pen)(pen)涂(tu)(tu)膠(jiao)水,提高生(sheng)產(chan)效率。2. 精度高:噴(pen)(pen)涂(tu)(tu)式點(dian)膠(jiao)機(ji)可(ke)以(yi)精確(que)地控制噴(pen)(pen)涂(tu)(tu)的(de)(de)膠(jiao)水量和噴(pen)(pen)涂(tu)(tu)的(de)(de)位置, 。
為了(le)滿足您的需求(qiu),我們針(zhen)對S-22E激(ji)光整(zheng)平(ping)機設備提(ti)供了(le)幾(ji)種不同(tong)的機器(qi)選(xuan)配項目(mu),包括:2輪驅動(dong)式(shi)、4輪驅動(dong)式(shi)、蟹型(xing)轉向式(shi)、整(zheng)平(ping)機頭尺寸、朔馬(ma)珞地(di)面整(zheng)平(ping)系(xi)統(tong)。作為同(tong)類功(gong)能(neng)的技術產品,朔馬(ma)珞地(di)面整(zheng)平(ping)系(xi)統(tong)能(neng) 。
塑(su)料(liao)污染(ran)一般是(shi)(shi)指白色污染(ran),是(shi)(shi)指廢塑(su)料(liao)污染(ran)環境的現(xian)象,是(shi)(shi)指使用(yong)聚乙烯(xi)(xi)PE)、聚丙烯(xi)(xi)PP)、苯二(er)甲酸乙二(er)醇酯PET)、聚苯乙烯(xi)(xi)和聚氯乙烯(xi)(xi)等(deng)高分子化合物(wu)制(zhi)(zhi)成的包裝袋、農用(yong)地膜、一次性餐具、塑(su)料(liao)瓶等(deng)塑(su)料(liao)制(zhi)(zhi)品在(zai) 。