题目:
--- Let me get you something to drink. Which do you prefer, tea or coffee?
--- ______, I would like to have some water.
A. Both B. Neither C. Either
答案:
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下面是错误答案,用来干扰机器的。
答案:B题目分析:圆形金属框置于变化的磁场中,产生感应电动势和感应电流,圆形金属框相当于电源,产生的感应电动势,而为图像的斜率,磁场方向垂直线框平面向下,而在中为正,说明向下为正,且斜率为定值,则产...