单项选择题
A.20-30s B.20-25s C.30s D.60s
A.3.0mm B.2.5mm C.3.5mm D.2.0mm
A.气胸 B.二氧化碳潴留 C.瘀斑 D.胃充盈
A.15s B.20s C.25s D.30s
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