單項(xiàng)選擇題

In four strokes engine, the cycle of events is completed in four strokes of （）.

A.the cylinder
B.the crankshaft
C.the piston
D.the cross-head

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單項(xiàng)選擇題

In each cylinder cover there are two or three holes for （）

A.the exhaust valves
B.the fuel valves
C.indicator cocks
D.the fuel pumps

單項(xiàng)選擇題

In each cylinder cover is a large central opening for mounting （）

A.the indicating cock
B.the starting valve
C.air inlet valve
D.the exhaust valve