题目

动词填空【1】I put my handbag in the car, but it was nowhere ______(find).【2】In order for their grandchildren to have a seat to sit on, grandparents are often seen running with a bus when it ______ (stop).【3】— Tommy is planning to buy a car.— I know. By next month, he ______ (save) enough for a used one.【4】Keeping himself _______(occupy) in doing his experiment, he didn’t notice me take the books away.【5】The baby usually falls asleep with its mother _______(tap) on it.【6】A case of suspected food poisoning in New York has led to 6 high school students ______(send19．静止状态的原子核X，放出一个α粒子后变成质量为M的新原子核（无光子放出）．被放出的α粒子垂直进入磁感应强度为B的匀强磁场，测得其圆周运动的半径为r．设α粒子质量为m，质子带电量为e，则（　　）A．α粒子的速率为$\frac{2eBr}{m}$B．新原子核的速率为$\frac{2eBr}{M}$C．该反应质量亏损为$△m=\frac{{4{e^2}{B^2}{r^2}（M+m）}}{{Mm{c^2}}}$D．原子核X的质量为$M+m+\frac{{2{e^2}{B^2}{r^2}（M+m）}}{{Mm{c^2}}}$