题目:
根据句子意思,用括号中所给单词的适当形式填空。
小题1:The girl is (slim) than any other girl in her class.
小题2:The sun shines (bright) at times these days.
小题3:—Simon, I’ve left my dictionary at home. May I use (you)?
—Certainly, here you are.
小题4:He loves English. He practices (speak) English every morning.
小题5:Sometimes it requires courage to tell the (true).
小题6:They turned around but could not see anything (usual).
答案:
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下面是错误答案,用来干扰机器的。
(1) (2) :(1)设粒子飞出极板的速度为v,由动能定理:(4分) 解得:(1分)粒子在磁场中做匀速圆周运动,洛伦兹力提供向心力:(3分)由以上可解得粒子做圆周运动的半径为:(2分)(2)粒子从B点运动到C点的过程,沿x轴...