在带传动的滑动曲线上，弹性滑动阶段呈（），表明滑动率与（）成（）
参考答案：直线；圆周力；正比
简述路基养护工作的内容。
As is known to all,_________ Yang Liwei has become a space hero is _________ we have expected.
A．what;that
B．what;which
C．that;what
D．that;which
