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【单选题】
超导的原理是（）A.
临界温度以下相互吸引的电子对的形成
B.
临界温度以下相互吸引的质子对的形成
C.
临界温度以下相互吸引的电子-质子对的形成
D.
临界温度以下相互吸引的中子对的形成
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反馈参考答案：
举一反三
【单选题】The company was financially ______ and almost went to bankruptcy during last year's economic recession.
A.
corrupt
B.
cornered
C.
ingredient
D.
covered
【判断题】Not all the students can live on campus during the university year.9：Not all the students can live on campus during the university year.
A.
正确
B.
错误
【单选题】During the students’ first teacher training year, they often visited schools for the _____ of lessons.
A.
examination
B.
investigation
C.
inspection
D.
observation
【简答题】During which time of the year did she work abroad?
【单选题】During the Spring Festival, the _____ family will reunite and celebrate the arrival of the new year happily. [ ]
A.
extended
B.
expanded
C.
registered
D.
revived
【单选题】During their first teacher training year, the students often visited schools for the ______ of lessons.
A.
observation
B.
investigation
C.
inspection
D.
examination
【简答题】During most time of year in Singapore it is ______.
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