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單項(xiàng)選擇題

A hot air start pipe indicates that there is （）.

A.inefficient cooling
B.a leaking air start valve
C.a clogged drain valve
D.a leaking air bottle

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單項(xiàng)選擇題

A high temperature alarm or （） which will melt is used to guard against the explosion of compressor air pipelines.

A.a flame trap
B.a relief valve
C.a fusible plug
D.a bursting cap

單項(xiàng)選擇題

A heater in the circuit facilitates warning of the engine prior to （） by circulating hot water.

A.starting
B.stopping
C.to start
D.to stop

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