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【单选题】
()属于液压系统中的控制元件。A.
换向阀
B.
油泵
C.
油马达
D.
蓄能泵
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举一反三
【单选题】So tired _____ after a whole day ’ s heavy work that I _____ stand on my feet.
A.
was I; could hardly
B.
was I felt; could hardly
C.
was I; couldn ’ t hardly
D.
I was; hardly couldn ’ t
【简答题】BEING an astronaut sounds cool, doesn't it? In space, they get to do some pretty amazing things, like floating in zero gravity(重力). However, there are also plenty of things that astronauts can't do be...
【简答题】词数 :327 话题 : 坚韧成就英雄 文体 : 记叙文 The morning after an evening struggle to care for my three-year-old daughter,I couldn ’ t wait to get her to school.I,as a mother,was tired from the anger and her inabilit...
【简答题】BEING an astronaut sounds cool, doesn’t it? In space, they get to do some pretty amazing things, like floating(漂浮) in zero gravity(重力). However, there are also plenty of things that astronauts can’t d...
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