2光4电光纤交换机和4光4电交换机有什么区别

元气满满Lily酱 2018-03-10 04:54:46 394 浏览

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水温水位传感器2芯和4芯的有什么区别?: 主要是指功能方面有什么区别，对仪表的使用有要求吗？... 主要是指功能方面有什么区别，对仪表的使用有要求吗？展开

太阳能热水的水温水位传感器2芯和4芯的有什么区别？: 原理图Z好以前用的都是2芯的，现在换4芯的能替换用么？如果可以，那么4芯的怎么接线。我的显示装置时比华丽的b-200型号。谢谢先！... 原理图Z好以前用的都是2芯的，现在换4芯的能替换用么？如果可以，那么4芯的怎么接线。我的显示装置时比华丽的b-200型号。谢谢先！展开

纳米材料翻译（4）: In this study the preparation of ultrafine powder of Bi2S3 by a reaction between bismuth octanoate and sulfur in organic solvent such as high boiling alcanes is reported. The first step was the preparation of bismuth octanoate. Bi(NO3)3Y... In this study the preparation of ultrafine powder of Bi2S3 by a reaction between bismuth octanoate and sulfur in organic solvent such as high boiling alcanes is reported. The first step was the preparation of bismuth octanoate. Bi(NO3)3⋅5H2O and octanic acid were used as the starting materials. The acid was reagent and solvent at the same time and was added in twice excess. After boiling the mixture of starting materials during 1 hour， the product was salted out by ethylacetate. The precipitate was filtered and dried in exxicator at room temperature.The second step was the synthesis of bismuth sulfide by boiling of bismuth octanoate and sulfur in decane during 2.5 hours. The dark grey precipitate was filtered and washed with hexane several times to remove the impurites. The product was dried in exxicator at room temperature. 展开

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