Before starting the turning gear, （） should be worked by h

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[单选题]Before starting the turning gear, （） should be worked by hand to minimize corrosive action on the liners.

A. the indicators
B. the starting valves
C. the cylinder lubricators
D. the turning gear

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[单选题]中间轴常见的失效形式有（）。

A. A．磨损
B. B．腐蚀
C. C．裂纹
D. D．断裂

[单选题]The efficiency of turbocharge system is increased by fitting a charge air cooler （） the compressor.

A. inside
B. before
C. after
D. against

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