In order to control thermal stresses, some types of modern engines use pistons with（）<br>A:heavy wall and intensive cooling<br>B:heavy wall and no cooling<br>C:thin wall and no cooling<br>D:thin wall and intensive cooling

In order to control thermal stresses, some types of modern engines use pistons with（）
A:heavy wall and intensive cooling
B:heavy wall and no cooling
C:thin wall and no cooling
D:thin wall and intensive cooling

出自：海船船员证

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