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女，49岁，胸部外伤致开放性气胸，出现呼吸困难和紫绀。给予立即封闭胸壁伤口，行闭式胸膜腔引流术为保持管道密闭，水封瓶长管没入水中（）

【参考答案】

A、10-12cm
B、5-8cm
C、15-20cm
D、3-4cm
正确答案：3-4cm

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