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
巷道施工主要工序包括？（）
A、破岩
B、装岩
C、运输
D、支护
—Could you get home at three o’clock?
—______．The meeting in our company won’t be over at that time．
A．I think so
B．I’m afraid so
C．Yes，I hope so
D．I’m afraid not
