慢性骨髓炎行死骨摘除术的最佳时机是
A.死骨形成
B.炎症急性发作时
C.死骨形成清楚,包壳充分形成
D.窦道长期不愈
E.病理骨折已愈合
参考答案:C
To his great surprise, John was elected___ chairman of _____ Students’Union.
A. a; a B. a; the c. the; the D. /; the
简述个性心理特征及其在管理中的应用。