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- yzz1223 2014-06-22 00:00:00
- 标准3（SM-3），海基发射，配合宙斯盾系统承担中段反导任务i，爱国者3（PAC-3），路基发射，承担的是末段反导任务，形象的说就是干掉那些标准三没拦截掉的漏网之鱼、。、、
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热门问答
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2014-06-21 12:51:35
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2012-12-05 05:43:33
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2012-07-01 10:36:47
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- 什么是标准3围？
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2007-11-09 08:08:34
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2018-11-24 02:01:18
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2011-02-27 00:35:03
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2010-06-06 03:47:49
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2010-10-09 02:04:38
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- 耐干摩擦≥3~4(深3)
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2015-12-03 15:51:22
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2010-12-08 18:19:27
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2013-02-22 14:18:56
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2018-12-05 21:11:28
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2017-04-03 12:44:15
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- 纳米材料翻译（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]. 展开
2006-10-18 03:54:51
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- so2+fe2(so4)3=？
2012-08-01 05:47:11
280
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- 三相电度表参数3*57.5/100V;3*1.5/(6)A;
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2017-09-16 02:55:31
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2017-12-16 07:56:09
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