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單項(xiàng)選擇題

In an oil cooler circulated by sea water, the oil is at a larger pressure, the result being that any leak in the cooler will mean a loss of （）.

A.oil
B.sea water
C.refrigerant
D.fresh water

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單項(xiàng)選擇題

In a four-stroke engine the camshaft rotates at （）.

A.half the engine speed
B.twice the engine speed
C.the engine speed
D.four times the engine speed

單項(xiàng)選擇題

In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder （） and the gases exhaust （）, there being an adequate overlap between the inlet opening and the exhaust closing.

A.downwards；upwards
B.upwards；downwards
C.downwards；downwards
D.upwards；upwards

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