A:一解
B:两解
C:一解或两解
D:无解
在光滑的水平地面上静止着一个斜面体,其质量为m2,斜面是一个光滑的曲面,斜面体高为h,底边长为a,如图所示。今有一个质量为m1,(m2=nm1)的小球从斜面体的顶端自静止开始下滑,小球滑离斜面体的下端时速度在水平方向,则下列说法正确的是( )
连线题。
①What colour are they? ____ A. Let's wait.
②Touch this. Is it hard?____ B. No, she can't
③Look at the light. It's yellow.____ C. They are black and white.
④Can she play yo-yo? ____ D. Yes, it is.