题目内容

使用中的立井罐笼防坠器,每半年应进行1次不脱钩检查性试验,每年应进行1次脱钩试验。

A. 正确
B. 错误

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沏茶时的温度以100℃为好,这样可以充分把茶泡开。

A. 正确
B. 错误

介绍经纪商(IB)在国际上既可以是机构也可以是个人,但一般都以个人的形式存在。()

A. 正确
B. 错误

A lube oil sample taken from the main engine lube oil system has dark yellow opaque color.This is the result of ()

A. water contamination
B. mixing oils of two widely different viscosities
C. overheating
D. aeratio

The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by ().

A. direct action of cam shaft
B. compressed air pressure
C. hydraulic “push rods”
D. direct action of the main piston moving dow

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