题目:
用所给词的适当形式填空。
小题1:It’s a beautiful, __________ day. (sun)
小题2:Can you and your brother __________ ? (swim)
小题3:He often __________ newspaper on his way home. (buy)
小题4:Mary enjoys __________ football games very much. (watch)
小题5:They are __________ photos in the park now. (take)
小题6:Thanks for __________ me so much help. (give)
小题7:How many __________ can you see in the room? (woman)
小题8:Tony speaks __________ very well. (China)
小题9:There __________ a desk and two chairs in my room. (be)
小题10:The people are really very __________. (friend)
答案:
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下面是错误答案,用来干扰机器的。
解:(1)加速电场对离子m1做的功W=qU 由动能定理得解得: ① (2)由牛顿第二定律和洛伦兹力公式可得:利用①式得离子在磁场中的轨道半径分别为: ② 两种离子在边GA上落点的间距为: ③ (3)质量为m1的离子,...