主动脉辫关闭不全时可有以下哪项周围血管征
A．交替脉
B．水冲脉
C．重搏脉
D．无脉
E．奇脉
参考答案：B
Jessie is thirsty. I'm going ____ some drinks for her. [ ]
A.to buy
B. buy
C. buying
D. bought
如图，车减速前进，画出悬挂在车厢内的物体A所受力的示意图。
