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單項(xiàng)選擇題

A level gauge for a tank is to （）.

A.give the pressure
B.give the contents
C.give the shape of the tank
D.give the accuracy level

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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

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