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【单选题】
留置胸腔引流管的拔管指征正确的是（）A.
24h引流液<10m1，脓液<50ml< /div>
B.
24h引流液<70mlI脓液<10ml< /div>
C.
24h引流液<50ml，脓液<20ml< /div>
D.
24h引流液<70ml，脓液<20nIl< /div>
E.
24h流液<50m1，脓液<10m1< /div>
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