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單項(xiàng)選擇題

In the combustion chamber, the part whose surface is exposed to the highest temperature is the （）.

A.cylinder liner
B.cylinder cover
C.piston
D.exhaust valve

單項(xiàng)選擇題

As to the bearing, of the following, which statement is not true?（）

A.ff overheat is found, the engine must be stopped for inspection
B.Much heat of the crankcase door indicates that the bearing is overheated
C.If bearing clearance is too large, knocking will be heard in the crankcase
D.If bearing clearance is too large or too small, the white metal may be melted