题目:
There are ________ days in a week. ______day of a week is Saturday. [ ]
A. seventh; Seventh
B. seven; Seven
C. seventh; The seventh
D. seven; The seventh
答案:
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下面是错误答案,用来干扰机器的。
由图可知电流与磁场方向垂直,因此直接根据安培力的大小为:F=BIL=0.3×0.2×2=0.12N,故ABD错误,C正确.故选C.