题目内容

蒸发量大于0.5t/h的锅炉,其安全阀的数量应为()。

A. 1个
B. 至少1个
C. 至少2个
D. 仅省煤器上安装即可

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最理想的流水施工组织方式是()。

A. 等节奏流水施工
B. 异节奏流水施
C. 无节奏流水施
D. 分别流水施工

This is one of the highest buildings that ______ in our city.

A. are ever built
B. have ever built
C. have ever been built
D. were ever built

Gelert was ______.

A. a cat
B. a wolf
C. the Prinee's enemy
D. a dog

By the time you came back yesterday, they ______ for London.

A. have left
B. left
C. had left
D. leave

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