急性肺脓肿最主要的临床表现是()
A.起病急,畏寒、发热
B.咳嗽、咯血
C.剧烈胸痛
D.湿啰音及支气管呼吸音
E.以上都不是
参考答案:E
We _____ bring the bag into the supermarket, but we _____ use a shopping
basket. [ ]
A. can; can't
B. can't; can
C. must; mustn't
D. mustn't; must
试述一氧化碳中毒时纠正缺氧的方法。