慢性骨髓炎行死骨摘除术的最佳时机是()
A.死骨形成
B.死骨形成清楚,包壳充分形成
C.窦道长期不愈
D.炎症急性发作时
E.病理骨折已愈合
参考答案:B
-Shall I look after your house while you are away?
-______.
A.If you like
B.It couldn’t be better
C.With pleasure
D.It’s up to you
简述清代军机处的设置及其职能。