慢性呼衰，给氧原则是（）
A.持续高流量
B.持续低流量吸氧
C.间断低流量
D.先高流量待动脉氧饱和度恢复正常改为低流量
E.间断高流量
参考答案：B
公共建筑的疏散楼梯两段之间的水平净距不宜小于( )cm。
A．10
B．15
C．20
D．25
He _______ reading books, but he doesn't_________reading one now.[ ]
A. would like; like
B. likes; feel like
C. likes; would like
D. would like; feel like
