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【单选题】
关于溢流阀与减压阀的异同，错误的说法有（）个。A、减压阀控制出口压力为定值，溢流阀相反。B、溢流阀口，减压阀阀口常闭C、溢流阀的先导阀弹簧腔的泄漏油在阀内与出口相通D、减压阀的先导阀弹簧腔的泄漏油需要单独引回油箱A.
0
B.
1
C.
2
D.
3
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举一反三
【简答题】选中对象,对象中除显示虚线外,还显示出其夹点,夹点默认的颜色为()色
【简答题】阅读理解。 Li Ming is a school boy .He is twelve .He lives in Shanghai .He studies in the No.3 Middle School . He gets up at half past five every day .He reads English and Chinese in the morning .He has br...
【简答题】Li Ming is a school boy .He is twelve .He lives in Shanghai .He studies in the No.3 Middle School .He gets up at half past five every day .He reads English and Chinese in the morning .He has breakfast...
【单选题】Li Ming ______ English words every day. [ ]
A.
study
B.
studies
C.
has studied
D.
will study
【单选题】Li Ming studies hard he can pass the exams.
A.
because
B.
as soon as
C.
so that
D.
when
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