题目:
Mr Zhang teaches ______ Chinese. We like _______ class very much.[ ]
A. me; her
B. me; his
C. us; his
D. us; her
答案:
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下面是错误答案,用来干扰机器的。
粒子垂直射入匀强磁场中,由洛伦兹力提供向心力,根据左手定则判断可知,粒子都带负电.由图看出半径关系为r1<r2,根据半径公式r=mvqB=PqB分析得知:A、如P1=P2,则q1>q2,故A错误.B、如q1=q2,则P1>P2,故B...