【单选题】Hua Jianhui was appointed _____ vice-governor of Anhui province in _____ place of the former, Wen Haiying. [ ]
【单选题】在下列液压阀中,不能作为背压阀使用的是( )。
【单选题】In order not to let the others hear what he said,he ______ the news to me.
【判断题】顺序阀的基本功能是控制多个执行元件的顺序动作,但不能作为背压阀使用。
【单选题】—Do you know ________, Mike? —On May 12th, 2008 [ ]
A.
when the earthquake took place in Wen Chuan
B.
when did the earthquake take place in Wen Chuan
C.
when the earthquake will take place in Wen Chuan
【多选题】下面的选项中属于背压阀的作用的是?()
C.
为计量泵创造良好的工作环境并改善泵的工作性能
D.
和脉动阻尼器配合使用以减小“水锤现象”对系统的危害,并减小流速波动的峰值,保护管路、弯头、接头不受压力波动的冲击
【单选题】Hu a Jianhui was appointed__________vice-govenor of Anhui province in________place of the former, Wen Haiying.