题目内容

土石坝排水设备有哪些类型？各有什么作用？试说明它们的优缺点和适用条件？

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Thus______________between England and France which was to last for 100 years.

A. broke out a war
B. did a war break out
C. a war broke out
D. was a war broken

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

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

A. is built
B. is being built
C. were built
D. are being built

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