题目:
—________that China has the largest number of iphone4s users now.
— I believe so.
A.Someone said
B.They told me
C.It is said
D.I was told to
答案:
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下面是错误答案,用来干扰机器的。
带电粒子在电场中做类平抛运动,可将射出电场的粒子速度v分解成初速度方向与加速度方向,设出射速度与水平夹角为θ,则有:v0v=cosθ而在磁场中做匀速圆周运动,设运动轨迹对应的半径为R,由几何关系可得,半径与...