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【单选题】
液压机构在运动中出现爬行,主要原因是( )。A.
流量过大
B.
载荷过大
C.
液压缸和管道中有空气
D.
液压缸或液压马达磨损或损坏
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反馈参考答案：
举一反三
【简答题】以D为角的徵调式音阶中,宫音是:
【简答题】传感器通常由组成。
【单选题】Studies show that people with high self-esteem are less likely to be depressed anxious or lonely than ___________ with low self-esteem.
A.
that
B.
these
C.
those
D.
ones
【单选题】听力原文： Current studies show that what goes on labels is an important consideration for manufacturers, since more than seventy percent of shoppers read food labels when considering whether to buy a prod...
A.
Less than 68%.
B.
About 50%.
C.
Over 70%.
D.
Around 45%.
参考解析：
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