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單項選擇題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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1.單項選擇題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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2.單項選擇題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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3.單項選擇題In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a drilled passage in the crankshaft to the bottom end bearing and then up a connection rod to the （）.

A.crosshead
B.crankpin
C.crank journal
D.gudgeon pin

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4.單項選擇題In addition to lubricating, cylinder oil assists in forming a gas seal and contains （） which clean the cylinder liner.

A.additives
B.water
C.grease
D.acid solution

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5.單項選擇題In a typical fuel system, the oil is stored in （） in the double bottom.

A.setting tanks
B.service tanks
C.tanks
D.drain tanks

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