A red mark on the pin identifies the lubrication point.
答案解析
解析:
举个生动的例子来帮助理解,就好比你在玩具上看到一个红色的箭头,箭头指向的地方就是你需要去的地方一样。所以在这道题中,红色标记就像是一个指引,告诉你需要润滑的位置在哪里。
相关知识点:
销上红标记,润滑点位置
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