题目内容

铆钉有半圆头铆钉、平头铆钉和抽心铆钉等，用于金属板材与材料，风管和部件之间的连接。垫圈有平垫圈和弹簧垫圈，用于保护连接件表面免遭螺母擦伤，防止连接件（）。

A. 紧固
B. 防潮
C. 严密
D. 松动

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