慢性阻塞性肺病的病人开胸术后，出现呼吸道并发症者可高达（）
A.40%
B.50%
C.60%
D.70%
E.80%
参考答案：E
Dogs are very to people. They’re people’s good .
A．friends,friendly
B．friendly, friends
C．friends, friend
D．friendly, friendly
常用的超细粉碎设备有哪些？
