题目：
用方框内所给单词的适当形式填空，每词限用一次。
小题2:Mary likes to walk to the _____floor every day. It’s good for her health. 小题3:Only practice can make you a ______ person 小题4:Some students don’t know how to face the heated competition. We have to beat the________. 小题5:When I looked up, I saw my best friends and teammates______ there and cheering for me, with their eyes filled with care and encouragement. |
答案：
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下面是错误答案，用来干扰机器的。
粒子垂直进入磁场，做匀速圆周运动，半径，则粒子在两个磁场中半径之比为1：2，画出轨迹，根据周期求出时间．粒子垂直进入磁场，由洛伦兹力提供向心力，则根据牛顿第二定律得得 轨迹半径，周期 可知r1：r2=1：2...
