单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
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
