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【简答题】
下各图所示的液压回路是由哪些液压元件组成的? 2 . 根据工作循环图 ,编写电磁铁动作顺序表(得电用“ + ”表示,断电用:“—”表示)。 3 .写出液压缸活塞杆快进、工作进给时的油液流动路线。 4 . 写出所示液压回路中都包括有哪些基本回路? 5 . 分别说明所示液压回路中各个主要元件的作用。
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举一反三
【单选题】Our teacher was very happy because failed the examination.
A.
everyone
B.
none
C.
both
D.
someone
【单选题】We went to see her ______ our teacher was ill in hospital . [ ]
A.
when
B.
during
C.
because
D.
however
【单选题】下列化学因数的表示式应为( ),被测组分Fe,沉淀形式Fe(OH) 3 ·XH 2 O 称量形式Fe 2 O 3
A.
2Fe／Fe 2 O 3
B.
Fe／Fe(OH) 3 ·XH 2 O
C.
Fe／Fe(OH) 3
D.
Fe 2 O 3 ／2Fe
【简答题】完形填空： It was Children's Day yesterday, we 1 the park. Our teacher was 2 us. 3 many people there. Some Young Pioneers (员) 4 near the river. 5 sang and danced. There were some 6 on the river. There w...
【简答题】计算下列化学因数。 称量形式 被测组分 (1)AgCl Cl (2) (3) Al
【单选题】Our teacher was trying to an accurate picture of history.
A.
draw
B.
present
C.
take
D.
write
【简答题】心肌自动节律性
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