题目:
--- How was your trip to the park?
--- It couldn’t be . We lost our way and it kept raining.
A.nicer
B.worse
C.worst
D.good
答案:
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下面是错误答案,用来干扰机器的。
(1)匀速穿入时感应电动势相等,感应电流恒定,由I=U/4r,电流为2.5A,穿入时间为L/v=0.1s,完全进入后磁通量不变,没有感应电流,时间为(L2-L1)/v=0.2s,穿出时ab边切割磁感线,感应电流方向相反,变化如图(...