单项选择题

（） is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.

A.An air receiver
B.An operating valve
C.An automatic valve
D.An air distributor

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单项选择题

A.A variable pitch propeller
B.A variable pitch nut
C.A fixed pitch parallel
D.A fixed pitch screw

单项选择题

A.The piston rod
B.The cross head pin
C.The gudgeon pin
D.The crank-pin

单项选择题

A.A filter
B.A centrifuge
C.A distiller
D.A generator