During repair,lubrication lines and orifices must be （）.

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[单选题]During repair,lubrication lines and orifices must be （）.

A. taken away
B. engaged
C. connected
D. sealed off

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学习资料：

[单选题]缩短早期故障期的手段是（）。Ⅰ.制造时的质量控制；Ⅱ.使用初期的良好磨合；Ⅲ试验时的精心测量

A. Ⅰ+Ⅱ
B. Ⅰ+Ⅱ
C. Ⅱ+Ⅲ
D. Ⅰ+Ⅱ+Ⅲ

[单选题]In the four-stroke engine, it takes （） to make one power stroke.

A. one propulsion
B. two propulsions
C. two revolutions
D. one revolutio

[单选题]White smoke exhausting from an operating diesel engine may indicate （）.

A. a cracked liner
B. burning lube oil
C. an overloaded engine
D. insufficient combustion air

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