题干
is no possibility Bob can win the first prize in the match.
A：There; that
B：It; that
C：There; whether
D：It; whether
答案(点此获取答案解析）
A
圆周轨道,圆心O在S的正上方.在O和P两点各有一质量为m的小物块a和b,从同一时刻开始,a自由下落,b沿圆弧下滑.以下说法正确的是( )