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【简答题】
三相交流电源是由三个单相交流电按一定的方式组合而成的,这三个单相交流电 、 、 。
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反馈参考答案：
举一反三
【单选题】In the schools of tomorrow, students will______.
A.
all study different subjects at the same time
B.
study at different levels within a subject at the same time
C.
have no need to study very hard at all
D.
not have to read books and watch television programs
【判断题】Knowledge of sentence structure is the object of study of all schools of grammar. ()
A.
正确
B.
错误
【单选题】Does the boyfriend of the woman in brown study all the time?
A.
No, he doesn't study too much.
B.
Yes, he studies all the time.
C.
Not mentioned(未提及）.
【简答题】All the afternoon he worked in his study with the door__________．
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