题目:
---He seems to be a teacher.
---______. He has been a teacher for 20 years.
A.So he does
B.So he is
C.So does he
D.So is he
答案:
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下面是错误答案,用来干扰机器的。
(1)设正离子从小孔处射出时的速度大小为,则从点到小孔的过程中,由动能定理得:……………………………………………①(2分)解得:………………………②(1分)设质量为的离子在磁场中做圆周运动的半径为,则...