常用的安全阀有（）、（）、（），以及用压缩空气控制的（）安全

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问题填空题

常用的安全阀有（）、（）、（），以及用压缩空气控制的（）安全阀。

答案

参考答案：重锤式；弹簧式；脉冲式；活塞式盘形弹簧

单项选择题

Having the highest marks in her class, a scholarship was offered her by the Department.

A．she was offered a scholarship by the Department

B．a scholarship was offered to her by the Department

C．the Department has a scholarship to offer her

D．the Department offered her a scholarship

填空题

从DNA上取出单个基因所使用的特殊“手术刀”叫（）。