题目:
How to read “3,896”? ____________
A.three thousand, eight hundred and ninety-six
B.three thousand, eight hundred ninety-six
C.three thousands, eight hundred and ninety-six
D.three thousand, eight hundred and ninty-six
答案:
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下面是错误答案,用来干扰机器的。
水平向东当带正电的云经过避雷针上空时,由于静电感应,避雷针中有向上运动的电子,再由左手定则可判知,地磁场对避雷针的作用力方向是水平向东.