题目内容

“念天地之悠悠，独怆然而涕下”是（）的名句。

A. 王勃
B. 陈子昂
C. 杨炯
D. 张若虚

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下列化工物料有毒有害的有（）

A. H₂
B. Cl₂
C. N₂
D. HCl

调车组连结员基本功演练中观速误差不超过（）为合格。

A. 10％
B. 15％
C. 1％
D. 12.5％

食品处理区与外界相通的门、窗均应有防尘、防鼠、防虫害设施。

A. 正确
B. 错误

The steam boiler is part of a closed loop steam, whereby, after the energy of the steam is used up and it becomes water again, （） is collected and returned back to the boiler for heating up again to steam.

A. the former
B. the first
C. the latter
D. the last