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[单选题]

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

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