单项选择题
In each cylinder cover there are two or three holes for （）
A.the exhaust valves
B.the fuel valves
C.indicator cocks
D.the fuel pumps
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相关考题
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单项选择题
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 -
单项选择题
In an ordinary four-stroke engine the exhaust valves open （）
A.after TDC
B.before TDC
C.after BDC
D.before BDC -
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
