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由焊接电源供给的，具有一定电压的两电极间或电极与焊件间，在气体介质中产生的强烈而持久的放电现象，称为（）
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【简答题】判断下列过程中哪些是①可逆的；②不可逆的；③可以是可逆的，并扼要说明不可逆的原因。
【单选题】What do Brian and Kelly do when they are running ?
A.
they chat
B.
they listen to music .
C.
they listen to the news.
【简答题】判断下列过程中哪些是①可逆的；②不可逆的；③可以是可逆的，并扼要说明不可逆的原因。
【单选题】What do Brian Nosek's preliminary results suggest?
A.
The change in bias against blacks is slow in coming.
B.
Bias against blacks has experienced an unusual drop.
C.
Website visitors' opinions are far from being reliable.
D.
Obama's popularity may decline as time passes by.
【简答题】What do Brian Nosek's preliminary results suggest? A．The change in bias against blacks is slow in coming. B．Bias against blacks has experienced an unusual drop. C．Website visitor's opinions are far fr...
【单选题】What will the woman probably do?
A.
See the movie with the man.
B.
See Professor Brian.
C.
See Harry Potter.
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