题目内容

简述聚氯乙烯糊树脂的危险性?

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You are carrying cargoes of crotonaldehyde,phosphoric acid,and morpholine on your multiple-product tanker. Which of the following statements is TRUE? ()

A. Each of the cargoes must be segregated from the other by at least two barriers
B. The minimum protective clothing required for taking samples of phosphoric acid is goggles or a face shield
C. Aluminum,copper,and zinc are prohibited in all valve parts in contact with these cargoes
D. The required warning sign must have the legend "cancer hazard" added to it

()原则是指幼儿园教师在进行班级管理工作中,要以最少的资源投入,尽可能地使幼儿获得更多、更全面、更快、更好的发展。

《人大法》编于()年,分为(),()大类,在编制技术上()冲破了严格的(),是第一部力图以()为指导编制的图书分类法。

双氧水对间接制版的作用是()

A. 显影
B. 坚膜
C. 剥膜
D. 脱脂

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