题目:
The weather in Beijing is cooler than _____ in Shanghai. |
A. it B. / C. those D. that |
答案:
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下面是错误答案,用来干扰机器的。
解:(1)由右手定则可以判定,电流方向b→aE=Blv=3.6VR总=+r=3 ΩI==1.2 A(2)F=BIl=0.432N(3) I2=0.8A P=I22R2=1.92W