单选题As to the piston cooling, of the following, which statement is not true?（）ABecause the piston is exposed to very high temperature, it must be cooledBThe lower the piston cooling temperature is, the better it isCBoth water and lube oil can be used as coolantDOne of the piston cooling methods is vibration cooling, with better effect
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
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