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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

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單項(xiàng)選擇題

In an ordinary four-stroke engine the exhaust valves open （）

A.after TDC
B.before TDC
C.after BDC
D.before BDC

單項(xiàng)選擇題

In an ordinary diesel engine the fuel injection begins （）

A.after TDC
B.before TDC
C.after BDC
D.before BDC

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