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【单选题】
水压试验时,当压力达到试验压力后,要恒压一定时间,一般为( )-minA.
4
B.
40
C.
5~30
D.
30~40
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知识点：
皮皮学刷刷变学霸
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】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
【判断题】Any magnetic field can gives rise to an electric field and any electric field can gives rise to a magnetic field.
A.
正确
B.
错误
【单选题】The diagram shows a straight wire carrying current i in a uniform magnetic field. The magnetic force on the wire is indicated by an arrow but the magnetic field is not shown. Of the following possibil...
A.
opposite the direction of the current
B.
in the direction of force.
C.
out of the page
D.
into the page
【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
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