【单选题】
A <{p _msthash="20552" _msttexthash="23457525"}>清除伤口内异物<{/p}>
B <{p}><{font _mstmutation="1" _msthash="20553" _msttexthash="63030630"}>切除失活的组织，彻底止血<{/font}><{br/}><{/p}>
C <{p _msthash="20554" _msttexthash="34493186"}>．根据情况缝合伤口<{/p}>
D <{p _msthash="20555" _msttexthash="21407880"}>必须放置引流<{/p}>
E <{p _msthash="20556" _msttexthash="25497121"}>留下明显的死腔<{/p}>
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