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【简答题】
6-7在图6-9所示回路中，已知活塞运动时的负载F=1200N，活塞面积A=15×10 -4 m 2 ，溢流阀调整值为p Y =4.5MPa，两个减压阀的调整值分别为p J1 =3.5MPa和p J2 =2MPa，如油液流过减压阀及管路时的损失可略去不计，试确定活塞在运动时和停在终端位置处时，A、B、C三点压力值。
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举一反三
【单选题】女性较男性易患尿路感染的原因没有(0.4)
A.
女性尿道短、直、宽
B.
尿道口与肛门、阴道相近
C.
女性月经期抵抗力降低
D.
女性妊娠期，压迫膀胱或使输尿管蠕动增加
E.
女性绝经期内分泌功能降低
【单选题】听力原文： Former U.S. president and Nobel Peace Prize winner Jimmy Carter on Sunday condemned preparations for a unilateral U. S. attack on Iraq, saying it would be an unjust war 'almost unprecedented in ...
A.
at Nobel Prize awarding ceremony.
B.
in The New York Times.
C.
in The Washington Post.
D.
at the Capitol Hall.
【单选题】For Bernard Lamb, the shift from 'ethnic minority' to 'minority ethnic' ______.
A.
is condemned by all the classes
B.
has no essential improvement at all
C.
is no more than a trend of degradation or back up
D.
reflects the conflict between the authority and the minorities
【单选题】女性较男性易患尿路感染的原因没有
A.
女性尿道短、直、宽
B.
尿道口与肛门、阴道相近
C.
女性月经期抵抗力降低
D.
女性妊娠期,压迫膀胱或使输尿管蠕动增加
E.
女性绝经期内分泌功能降低
【单选题】The two children，whose parents passed away，______to a life at hardship. [ ]
A.
were condemned
B.
condemned
C.
comdemning
D.
was condemned
【单选题】听力原文： Former U. S. president and Nobel Peace Prize winner Jimmy Carter on Sunday condemned preparations for a unilateral U.S. attack on Iraq, saying it would be an unjust war 'almost unprecedented in ...
A.
at Nobel Prize awarding ceremony
B.
in The New York Times
C.
in The Washington Post
D.
at the Capitol Hall
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