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【单选题】
(第十章)产生焊接应力与变形的根本原因是 。
A.
材料导热性差
B.
焊接时组织变化
C.
局部不均匀加热与冷却
D.
焊接时输入的热量过大
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【简答题】nervou s,speech I when I give a .
【单选题】直流发电机电刷在几何中线上,如果磁路不饱和,这时电枢反应是 。
A.
去磁
B.
助磁
C.
不去磁也不助磁
D.
无法判断
【简答题】直流发电机电刷在几何中线上,如果磁路不饱和,这时电械反应是() A去磁 B助磁 C不去磁也不助磁
【单选题】Donald Trump won election in the year of _____.
A.
2015
B.
2016
C.
2017
D.
2018
【简答题】As long as there is water, plants won ’t die quickly.英译汉
【简答题】In terms of marriage, most people tend to __________. [A] get married after careful consideration [B] be attracted by someone living in an alien land [C] be well-matched in social and economic status ...
【单选题】直流发电机电刷在几何中线上,如果磁路不饱和,这时电械反应是
A.
去磁
B.
助磁
C.
不去磁也不助磁
【单选题】I tend to get nervous when ( ) to make a presentation to a large group of people.
A.
be asked
B.
asked
C.
asking
【单选题】Trump quickly won his party's nomination to ____ the elections.
A.
contract
B.
contest
C.
contact
D.
content
【单选题】直流发电机的电刷在几何中线上,如果磁路不饱和,这时的电枢反应对磁场的影响是( )
A.
去磁
B.
助磁
C.
不去磁也不助磁
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