慢性阻塞性肺疾病的临床特点是
A.咳嗽、咳痰
B.病程中呈现反复急性发作后加重和治疗后缓解
C.血气分析有氧分压和酸碱度的改变
D.肺功能检查显示慢性气流受限
正确答案是B
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Passage One
Many people believe thatbeavers are intelligent animals. After all,their dams are fine examples of engineering. The engineering featsof beavers are well known, but it will be useful to recall t