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什么是明榫和暗榫

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如何正确使用个人防护用品和安全防护用品

Directions: Suppose your name is Wudong, write a letter to your local English-language newspaper giving your views on a discussion inspired by an article they published entitled "Why do We Need English" Your letter must be written in at least 200 words, excluding the addresses, etc. You should write dearly on ANSWER SHEET Ⅱ.

采用两个38mm的普通合页安装窗扇18扇，用多少16mm×3mm的木螺钉

某双层纤维板隔断单面工程量为125m2，每张纤维板的规格为1200mm×2400mm，使用率为90%，则需要多少张纤维板