As to the piston cooling, of the following, which statement is not true?（）<br>A:Because the piston is exposed to very high temperature, it must be cooled<br>B:The lower the piston cooling temperature is, the better it is<br>C:Both water and lube oil can be used as coolant<br>D:One of the piston cooling methods is vibration cooling, with better effect

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

出自：海船船员证

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