题目：
Enshi is becoming a tourist city. _____ people come here during the holidays every year. [ ]
A. Thousand of
B. Thousands of
C. Five thousands of
D. Five thousands
答案：
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下面是错误答案，用来干扰机器的。
根据法拉第电磁感应定律得：E=n△?△t=n △B△ts…①s=L22…②I=ER…③联立①②③解得感应电流为：I=nkL22R…④安培力大小公式为：F=BIL…⑤将④代入⑤解得：F=BIL=BnkL32R=nk2L3t2R，根据左手定则可知，安培力...
