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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

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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

單項(xiàng)選擇題

A gudgeon pin in a trunk piston may be free to float and rotate, with （） to limit axial movement.

A.split pins
B.crankpins
C.dipsticks
D.circlips

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