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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

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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

單項(xiàng)選擇題

In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a （） in the crankshaft to the bottom end bearing andthen up a connection rod to the gudgeon pin.

A.telescopic pipes
B.large bore
C.drilled passage
D.tied rod

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