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
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A.after TDC
B.before TDC
C.after BDC
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A.after TDC
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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 （）.
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