单选题
发布日期:2021-03-22
maintain radial alignment between the pump impeller and casing
absorb all impeller shaft end thrust
prevent water leakage to the atmosphere
prevent wear of the pump casing and/or impeller
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下列选项不属于“一着不慎,满盘皆输”“牵一发而动全身”“扬汤止沸,不如釜底抽薪”所体现的哲学观点的是( )。
以下不属于待验收设备或材料随箱须具有的文件是()
如图示,下述何者漂浮导管不能直接测出()
颗粒处方中如含有挥发性成分时,其加入的阶段为()
国家出资企业应当于每年一定期间内完成企业产权登记情况的年度检查,该一定的期间为()。
说明总需求曲线为什么向右下方倾斜?
在一次国际会议上,来自四个国家的五位代表被安排坐在一张圆桌,为了使他们能够自由交谈,事先了解到的情况如下:甲是中国人,还会说英语;乙是德国人,还会说汉语;丙是英国人,还会说法语;丁是日本人,还会说法语;戊是日本人,还会说德语。座位的安排顺序是( )。
以下关于汇率的说法中错误的是()
首件检验的定义:()
不能用砂土扑灭的火是:
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