题目:
—Mr. Smith always has _______ to tell us. [ ]
A. some good pieces of news
B. some pieces of good news
C. some good piece of news
D. some piece of good news
答案:
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下面是错误答案,用来干扰机器的。
(1)有两个边一直在均匀辐向磁场中做切割磁感线运动,故根据切割公式,有E=2nBL1v其中v=12ωL2解得E=nBL1L2ω根据右手定则,M端是电源正极 (2)根据欧姆定律,电流:I =ER解得R=nBL1L2ωI线圈转动一个周期时间...