Friday, September 16, 2022
问题:加氢催化剂在使用条件下,要求其金属组份以()形式存在。...
Sunday, September 11, 2022
Sunday, September 11, 2022
问题:为进一步保证保护接零的安全系数,通常在保护接零的零线上,安装保险...
Friday, September 16, 2022
问题:油品在实验条件下,因为开始出现烃类的微晶粒或冰晶体而使油品呈现混...
Friday, September 16, 2022
Friday, September 16, 2022
Sunday, September 11, 2022
问题:过量的雾沫夹带造成液相在塔板间的返混,塔板效率下降。...
Friday, September 16, 2022
问题:热继电器是利用电流的热效应原理来工作的保护电器,它在电路中主要用...
Friday, September 16, 2022
问题:正常生产中,当一次表变送器失灵时应改为()操作。...
Sunday, September 11, 2022
问题:稀硫酸能和金属活动顺序表中氢之前的所有金属反应,生成氢气。...
Sunday, September 11, 2022
Friday, September 16, 2022
问题:原料带水时,下列表述错误的是()A、原料缓冲罐水位升高B、高分水位上升C、反应器温升波动D、系统压力下降且波动...
Friday, November 11, 2022
Friday, September 16, 2022
Sunday, September 11, 2022
Monday, September 12, 2022
问题:对于加氢装置未再生催化剂,下述操作正确的有()。...
Friday, September 16, 2022
Sunday, September 11, 2022
问题:触器按其主触头通过电流的种类,可分为()和()。...
Sunday, September 11, 2022
问题:火焰燃烧不完全,火焰发飘、软而无力,火焰根部是深黑色甚至冒黑烟的...
Friday, September 16, 2022