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【单选题】
选择题: 用定量泵和节流阀组成的进、回油路节流调速回路中,若使节流阀起调速作用,在液压系统中必须有( )。A.
与之并联的溢流阀
B.
与之串并联溢流阀均可
C.
有否溢流阀没关系
D.
与之串联的溢流阀
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参考解析：
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皮皮学刷刷变学霸
举一反三
【简答题】测量误差可分为（）误差、粗大误差和随机误差。
【单选题】—Tina had nothing for supper, _____ she? —_____. She had some bread and milk. [ ]
A.
had, Yes
B.
had, No
C.
did, Yes
D.
did, No
【单选题】The little field _______ with seaweed some weeks before, and the weeds _______ and whitened on the grass. A. had manured, had rotten B. had manured, had rotted C. had been manured, had rotten D. had b...
A.
had manured, had rotten
B.
had manured, had rotted
C.
had been manured, had rotten
D.
had been manured, had rotted
【简答题】A．had talked to B．had seen C．had been with D．had visited
【简答题】测量误差可分为( ) 、( )和粗大误差三种。
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