缓解肺气肿患者呼吸困难的首选措施是
A．胸腔引流
B．通畅呼吸道，持续低流量吸氧
C．镇静剂
D．强心剂
E．呼吸兴奋剂
参考答案：B
The mother didn’t know _____to blame for the broken glass as it happened while she was out.
A．who
B．which
C．they
D．that
金融发展主要是指()。
A.金融资产规模扩张
B.金融机构数量扩张
C.金融产品复杂化
D.金融效率提高
