Michael America on a cold spring morning. A. leave B. leaves C. left
摆长为l的单摆做小角度摆动，若摆球的质量为m，最大偏角为θ(θ<10°),则： （1）摆球经过最低点时的速度是多大？ （2）从最大位移处摆向平衡位置
函数f(x)＝的定义域为( ) A． (－∞，4] B． (－∞，3)∪(3,4] C． [－2,2] D． (－1,2]
This kind of car was _________ in 1890. A. discovered B. invented C. looked out D. found out
1. He is a man of _______ ideas and he often makes a careful plan _________. A. advanced; before advance B. advancing; in advance C. advanced; in advance D. advan
小铁块置于长木板右端，木板放在光滑的水平地面上，时使二者获得等大反向的初速度开始运动，经过时间铁块在木块上停止滑动，二者相对静止，此
下列各项判断与分析中，正确的一项是（ ） A．“大国工匠”“记住乡愁”“精准扶贫”“履职尽责”四个短语结构各不相同。 B．“核心价值观
Before she appeared on the reality show(真人秀) Britain’s Got Talent, Susan Boyle was just an ordinary middle-aged British woman. Now all this is going to change. She lives in a house with he
