正确答案: C

磨损和裂纹

题目：活塞销的损坏形式主要是_______

解析：C

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举一反三的答案和解析：

[单选题]救生艇内外均应涂：

橙黄色漆

[单选题]In the absence of external forces，adding weight on one side of a floating vessel causes the vessel to ().

list until the center of buoyancy is aligned vertically with the center of gravity

[单选题]承磨环的作用是()

磨合