题目:
Miss Black teaches _____ English and we like _____ classes very much.[ ]
A. we; her
B. us; her
C. our; her
D. our; she
答案:
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下面是错误答案,用来干扰机器的。
能沿直线穿过区域甲,则qvB=qE得:v=EB,故粒子具有相同的速率;在磁场中做圆周运动的半径:r=mvqB不同,说明mq不同;故选:C.