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【简答题】
如图所示,两系统中溢流阀的调整压力分别为 p A =4MPa, p B =3MPa, p C =2MPa 。 当系统外负载为无穷大时,泵的出口压力各为多少?对图a的系统,请说明溢流量是如何分配的?
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How the writer spent his summer holidays.
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What′s the weather like in summer.
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When the writer got up in the summer holidays.
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Where the writer took a walk in the summer holidays.
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the established educational system.
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a kind of tool.
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the thoughts of Booker T. Washington.
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the supporters of Booker T. Washington.
【单选题】After school we usually play ______ soccer for half ______ hour on ______ playground. [ ]
A.
/; an; the
B.
the; a; the
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/; a; a
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the; an; a
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【单选题】The adoption of orphans and physically challenged children has been a subject of public debate _____ a fire in an unregistered orphanage last month.
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according to
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in case of
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ever since
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such as
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