继发性气胸最常见的基础疾病是()
A.肺结核
B.COPD
C.间质性肺疾病
D.肺脓肿
E.正压通气
参考答案:B
Be careful when you deal with this chemical, as it will explode when _____ to sunlight. [ ]
A. being exposed
B. to expose
C. exposing
D. exposed
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