螺旋传动按摩擦性质可分（）、（）、静压螺旋。
参考答案：滑动螺旋；滚动螺旋
______for a long time, but he tried his best to make up for what he missed.
A．Being ill staying in hospital
B．Having been ill staying in hospital
C．To be ill staying in hospital
D．He was ill staying in hospital
临床常见气逆证，与下列关系最为密切的是
A．肺脾胃
B．肺胃肾
C．肺心肝
D．心肾肺
E．肝肺胃
