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單項(xiàng)選擇題

（） 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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單項(xiàng)選擇題

（） is made of a boss with separated blades mounted into it.

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

單項(xiàng)選擇題

（） is fully floating in both connecting rod small end and the piston skirt.

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