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- 標準篩網(wǎng)R20/3 R20 R40/3什么意思
2018-11-11 00:16:49
990
0
- 三相電度表3*3(6)表示什么意思
2010-12-08 18:19:27
545
2
- 電度表 3 phase,4 wire,3 element 什么意思
2018-12-05 21:11:28
404
0
- 標準3和愛國者3有何區(qū)別
2014-06-21 12:51:35
339
1
- 3線CCD什么意思
- 3線CCD什么意思
2018-11-15 04:16:21
427
0
- 斷路器nsu630n/3什么意思
2014-12-29 15:02:04
397
1
- 3目篩網(wǎng)網(wǎng)眼是多少毫米
- 3目篩網(wǎng)網(wǎng)眼是多少毫米
2018-06-26 04:26:02
315
1
- 篩網(wǎng)3目半是多大????????
2015-04-26 23:21:12
439
1
- 什么是標準3圍?
- 標準的3圍是多少??請標明胸圍,腰圍,臀圍。謝謝
2007-11-09 08:08:34
471
3
- 投影儀幕布100 4:3什么意思
2012-06-22 23:14:06
594
4
- 請問有誰知道3*3有機硅帆布的執(zhí)行標準是什么呀
2018-11-24 02:01:18
333
0
- 聲級計 1/3八音度帶通濾波器什么意思?
2014-08-13 10:34:51
400
1
- 電度表上3*1.5(6A)或3*3(6A)表示什么
2010-10-09 02:04:38
744
1
- 耐干摩擦≥3~4(深3)
- 耐干摩擦≥3~4(深3)
2015-12-03 15:51:22
425
1
- 馬自達3昂克賽拉dsc什么意思
2015-04-24 17:08:27
465
1
- 比例式3:2減壓閥3:2是什么意思
2017-04-03 12:44:15
870
1
- 電流表3*3的和3*1.5的表接電流感器有什么區(qū)別
- 今天去五金店買電流互感器和電子式計量表,往常拿的都是3*1.5(6A)的電子表??墒墙裉旆榱艘矝]找到,只找到3*3(6A)的計量表,用我知道都能用,但是我不知道區(qū)別在哪,那種使用效果好?
2012-07-01 10:36:47
538
3
- 寶馬3系轉(zhuǎn)速表下面的小表什么意思
- 我看圖片和視頻上寶馬3的轉(zhuǎn)速下面有個小的指針上面有01020的刻度是干什么用的也不是渦輪的壓力表啊以前老款的翼豹EVO也有個小表世上顯示1.01.52.0那個說是渦輪的增壓表可是BMW也不是渦... 我看圖片和視頻上寶馬3 的轉(zhuǎn)速下面有個小的指針上面有0 10 20 的刻度 是干什么用的 也不是渦輪的壓力表啊 以前老款的翼豹 EVO 也有個小表世上顯示1.0 1.5 2.0 那個說是渦輪的增壓表 可是BMW 也不是渦輪發(fā)動機啊 哪個小的表是干什么用的 而且一加油還動 展開
2008-04-25 11:07:11
879
7
- so2+fe2(so4)3=?
2012-08-01 05:47:11
353
3
- 納米材料翻譯(3)
- The preparation of ultrafine powder of bismuth sulfide The synthesis of binary metal sulfides has been the focus of attention because of their important physical and chemical properties [1, 2], good commercial applications in semiconductor... The preparation of ultrafine powder of bismuth sulfide The synthesis of binary metal sulfides has been the focus of attention because of their important physical and chemical properties [1, 2], good commercial applications in semiconductors, pigments, luminescence devices, solar cells, IR detectors and optical fiber, communications, modern thermoelectric coolers [3]. Bismuth sulfide (Bi2S3) is a direct band gap material with Eg of 1.3? eV [4] and useful for photodiode arrays of photovoltaics [5]. Usually, busmuth sulfide can be prepared by direct reaction of bismuth and sulfur vapor in a quartz vessel at high temperature [6]. The chemical deposition method was applied to prepare bismuth sulfide through reaction of bismuth salt complexed by triethanolamine or EDTA with an aqueous solution containing a sulfur sourse such as thioacetamide, thiourea, sodium thiosulphate, geseous H2S. However, the powders obtained through this route are mostly amorphous or poorly crystallized [7–10]. The thermal decomposition preparation of bismuth sulfide was also reported by thermal decomposition of bismuth dithiocarbamate complexes [11], metal ethylxanthate [12], Bi-thiourea complex [13]. However, all these methods required high temperature or else the final poducts contain some impurites. Some researches use nonagueous solutions for depostion of bismuth sulfide thin films, but they have got amorphous products [14, 15]. Yu and Qian reported thermal synthesis of Bi2S3 through a reaction of BiCl3 and thiourea in ethanol at 140? °C [16]. 展開
2006-10-18 03:54:51
357
4
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