腋窝、肩部的出血（）
A.锁骨下动脉指压止血法
B.锁骨上动脉指压止血法
C.肱动脉指压止血法
D.桡动脉指压止血法
E.股动脉指压止血法
参考答案：A
Only when _____ in the afternoon _____ able to leave.
A．the match was over; they were
B．was the match over; were they
C．was the match over; they were
D．the match was over; were they
质量为m的汽车，启动后沿平直路面行驶，如果发动机的功率恒为P，且行驶过程中受到的阻力大小一定，汽车速度能够达到的最大值为v，那么当汽车的车速为时．汽车的瞬时加速度的大小为( )
A．
B．
C．
D．
时．汽车的瞬时加速度的大小为( )
