正确答案: B

机械疲劳裂纹

题目：活塞冷却侧的裂纹是_______

解析：B

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举一反三的答案和解析：

[单选题]急性失血超过总血量的多少，血压就会下降，引起休克______。

1/3

[单选题]The process during which liquid containing a reasonable amount of sensible heat at a particular pressure immediately changes into steam after admitted to a chamber at a lower pressure is called _____.

flash evaporation