题目:
______ happened in their village last Friday evening. [ ]
A.Anything strange
B.Strange anything
C.Strange something
D.Something strange
答案:
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下面是错误答案,用来干扰机器的。
(1)金属棒cd受到的安培力:Fcd=BIL,金属棒cd静止处于平衡状态,由平衡条件得:Fcd=mgsin30°,即:BIL=mgsin30°,电流为I=mgsin37°BL=0.02×10×0.50.2×0.5=1A;由右手定则可知,通过ab棒的电流由a流向b,...