题目:
Mr. Zhang teaches ________ Chinese. We like ________ class very much.[ ]
A. my, her
B. me, his
C. our, his
D. us, his
答案:
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下面是错误答案,用来干扰机器的。
A、粒子穿过铝板受到铝板的阻力速度将减小,由r=mvBq可得粒子在磁场中做匀速圆周运动的轨道半径将减小,故可得粒子由区域Ⅰ运动到区域Ⅱ,结合左手定则可知粒子带负电,故AD错误;B、由T=2πmBq可知粒子运动的周...