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【单选题】
速度控制回路是研究液压系统的( )调节和变换问题。A.
压力
B.
速度
C.
流量
D.
力
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皮皮学刷刷变学霸
举一反三
【单选题】Although Math is very difficult, you can't _____. [ ]
A.
give in it
B.
give it in
C.
give up it
D.
give it up
【单选题】Math is a little difficult, but I still like it very much.
A.
few
B.
kind
C.
kind of
D.
a few
【单选题】公元前 370多年以前,西方医学鼻祖希波克拉底( Hippocrates)就提出
A.
人体的结构
B.
消毒原理
C.
环境对健康的影响
D.
免疫接种的方法
E.
大卫生的观念
【单选题】Math is a difficult subject for David. He often gets _____ in class.
A.
bored
B.
excited
C.
confused
【单选题】—Math is too difficult, I nearly give it up. —Please don't, nothing is ______ if you put your heart into it. [ ]
A.
important
B.
impossible
C.
interesting
【单选题】—Math is too difficult. I want to give it up. —Please don’t. Nothing is _________if you put your heart into it.
A.
important
B.
impossible
C.
interesting
D.
Necessary
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