A:1条
B:2条
C:3条
D:4条
- I'm tired. I want to have a day _________ next week.
- Great idea, honey. You do need a break.
I've _______ stomach ache.
若一段圆弧的长度等于该圆内接正三角形的边长,则这段弧所对圆心角弧度为( )
一列横波沿绳子向右传播,某时刻形成如图所示的凸凹形状,对此时绳上A、B、C、D、E、F六个质点( )