單項選擇題

Scavenging is （） of exhaust gases by blowing in fresh air.

A.the suction
B.the compression
C.the removal
D.the deliver

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單項選擇題

Rotating flyweights acting against spring pressure make a simple type of （）.

A.governor
B.safety valve
C.reducing valve
D.feed water regulator

單項選擇題

Remote control means that the system is being controlled by the operator who is situated （） from the system.

A.automatic
B.local
C.remote
D.manual

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