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【判断题】
误差不具有累积性。A.
正确
B.
错误
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皮皮学刷刷变学霸
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【单选题】Henry can't attend the party _____ at Tom's house at present because he is preparing tomorrow's presentation. [ ]
A.
hold
B.
to hold
C.
to be held
D.
being held
【单选题】在正反转电路中,将常闭辅助触点互相串联在对方的吸引线圈电路中,其目的是为了( )。
A.
保证两个接触器的主触点不能同时动作
B.
能灵活控制正反转运行
C.
保证两个接触器可以同时带电
D.
起自锁作用
【简答题】正反转控制中 将接触器KM1与KM2常闭触点分别串接在对方线圈电路中,防止主电路发生两相电源短路事故,形成相互制约的控制,称为( )或( )控制。
【简答题】一个工厂由于采用新工艺，现在每件产品的成本是20.4元，比原来降低了15%．原来每件产品的成本是多少元？
【单选题】. I’m sorry to have known my train arrives in New York at eight o’clock tonight. The plane I would like to take from there ____ by then.
A.
will have left
B.
would leave
C.
had left
D.
has left
【单选题】Some students can't attend ground classes because they ______.
A.
are too lazy
B.
don't have the money to study
C.
may not be able to attend classes for military reasons
D.
are sick or too busy
【简答题】一个工厂由于采用新工艺，现在每件产品的成本是37.4元，比原来降低了15%。原来每件产品的成本是多少元？
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