题目内容

当容器的直径小到一定数值时，气体混合物便不能自燃。

A. 正确
B. 错误

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An iron and steel works, with several satellite factories,______________in that city now.

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礼仪对象是指礼仪活动和行为的操纵者和实施者。

A. 正确
B. 错误

He traveled to the Northern part of the country, ______________he got many newideas for this book.

A. which
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