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【判断题】
正丁醚制备反应开始回流时,温度会迅速上升至135°C。( )A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】计算： （1）（- ）×（-1 ）÷（-2 ）； （2）-6÷（-0.25）× 。
【简答题】magnetic field coil
【单选题】I usually _____ the newspaper of that day when I am having breakfast.
A.
read of
B.
read through
C.
read about
D.
read out
【单选题】A residual magnetic field is always?
A.
Stronger than the magnetic field producing it
B.
Weaker than the magnetisiing field producing it
C.
Equal to the magnetising field producing it
D.
None of the above
【简答题】计算： 小题1:(1)（6分） ； 小题2:（2）（6分） ．
【简答题】已知（1-2x） 6 =a 0 +a 1 x+a 2 x 2 +…+a 6 x 6 ，则|a 0 |+|a 1 |+|a 2 |+…+|a 6 |=（ ）。
【单选题】I can’t pretend ________ happy when I am not.
A.
to be
B.
to have been
C.
being
D.
having been
【单选题】–Were you at school when he came to see you? –Yes, I ______ a math class.
A.
was having
B.
had
C.
am having
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