喜蹲踞
A．室间隔缺损 B．房间隔缺损 C．动脉导管未闭 D．法洛四联症 E．肺动脉狭窄
参考答案：D
How often do you go shopping?
A．Twice a week
B．For two days
C．One time
D．Some times
下列四幅图中的做法，能够减小压强的是 [ ]
A.
B.
C.
D.
