Air cocks, usually positioned at the （） in a circulating s

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[单选题]Air cocks, usually positioned at the （） in a circulating system, is used to get rid of the air in the system.

A. bending joint
B. expansion tank
C. weld
D. the highest point

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[单选题]There is （） in any water cooling system for a diesel engine allowing for expansion and water make-up in the system as well as air vent and chemicals addition.

A. a setting tank
B. a service tank
C. a head tank
D. an expansion joint

[单选题]On a turbo-charged, medium-speed diesel engine, which of the following problems is an indication of a restricted air intake passage?（）

A. Engine is hard to start
B. Engine misses
C. Surges at governed RPM
D. Coolant temperature is too low

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