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[单选题]

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

A . Because the piston is exposed to very high temperature, it must be cooled

B . The lower the piston cooling temperature is, the better it is

C . Both water and lube oil can be used as coolant

D . One of the piston cooling methods is vibration cooling, with better effect

参考答案与解析：

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