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【简答题】
一高压管末端接喷嘴，如下图所示，已知喷嘴出口直径为10cm，管道直径为40cm，流量Q为0.4 m3/s，则管嘴对水流的作用力为（ ）。【图片】
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【简答题】Microsoft founder Bill Gates said that he planned to give away almost all of his vast ① fortune, largely to the cause of global health, during the course of his lifetime. With an estimated ② worth of ...
【单选题】It was ____ the old worker came that we ____ the experiment.
A.
until; didn’t begin
B.
not until; began
C.
until; began
D.
not until; didn’t begin
【多选题】人身保险利益的构成条件
A.
投保人与保险人的之间须有利害关系
B.
投保人与保险公司的保险合同中的保险利益必须是合法利益
C.
投保人与保险标的之间须有金钱利益
D.
被保险人和受益人之间须有利害关系
【简答题】139邮箱电子账单如何开通？
【单选题】Which quadrant should say “no” if you can?
A.
The first quadrant
B.
The third quadrant
C.
The fourth quadrant
D.
The second quadrant
【单选题】I ______ go to bed ______ my father came back. [ ]
A.
won't, until
B.
didn't, until
C.
will, until
D.
/, when
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