矿井排水设备主要由水泵、拖动设备、吸水管、排水管道、管道附件和仪表等组成。
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酯交换是指()。其作用是()。当()时为无规酯交换;当()时为定向酯交换。
Deck machinery, which is also known as hull machinery, includes all power driven equipment located ()the machinery spaces that is () with the main propulsion plant.
A. inside;associated
B. inside;not associated
C. outside;associated
D. outside;not associated
患者腰痛以疫软为主,喜按喜揉,腿膝无力,遇劳更甚,卧则减轻。治疗应选用()
A. 牛膝
B. 桃仁
C. 红花
D. 郁金
E. 鸡血藤
质量评审中B1类缺陷对于用户的影响为()。
A. 整车不能使用
B. 整车必须进行修理
C. 用户计划将此缺陷消除
D. 用户对质量