从施工升降机吊笼上卸料后应在（）后，司机才能将吊笼驶离平层位置。
A. 关掉总电源
B. 锁好停层保护装置
C. 关好围栏门
D. 关好吊笼门和层门
How is the external flotation bladder of an immersion suit inflated?（）
A. It is inflated by a small CO2 bottle that is automatically tripped when the front zipper is at the top of the zipper track
B. It is inflated by a small CO2 bottle that is manually tripped
C. It is inflated by blowing through an inflation tube
D. It inflates by seawater bleeding into the inflation bladder and reacting with a chemical
信息人力资源的培训的类型有哪些？分别培训哪些内容？
化工机械分为哪两部分？他们的安装、修理工艺程序大致分为哪些步骤？
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