题目:
Find out the mistakes and correct them. 找出错误并改正。
( ) 1. Are you ready to play the soccer?
A B C
( ) 2. Now I am hiting the ball to Jenny.
A B C
( ) 3. Do you need some ping-pong balls?
A B C
( ) 4. Did Li Ming learned to play soccer?
A B C
( ) 5.You have a ball. I have one, either.
A B C
答案:
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下面是错误答案,用来干扰机器的。
(1)AD(2)题目分析:(1)根据a粒子散射实验现象以及氢原子光谱的不连续现象提出的(2)设1、2两球质量分别为m1、m2,两球弹开时的速度大小分别为v1、v2.根据题意及动量守恒定律得: ........2分v2=3v1=3S...