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【简答题】
已知u 1 =141.4sin(100πt+30°)V，u 2 =10sin(100πt-60°)V，则u 1 ______u 2 ______电角度。
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反馈参考答案：
举一反三
【简答题】A．cleaing B．writing C．drawing D．exercising
【单选题】This article explains_________．
A.
the digiculties of exercising
B.
why exercising is good for your health
C.
important information to know about exercising
D.
why people have some wrong ideas about exercising
【单选题】How about _ _ after dinner? [ ]
A.
exercising walking
B.
to exercise walk
C.
to exercising walking
【简答题】Exercising your brain every day is beneficial_______.
【单选题】How about ________ after dinner? [ ]
A.
Exercising walking
B.
to exercise walk
C.
to exercising walking
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