骨髓炎为什么容易形成慢性？慢性骨髓炎的治疗原则是什么？有哪些手术方法？如何选择应用？
腰椎间盘突出症有哪些表现以及腰椎间盘突出症的治疗原则是什么？
My supervisor asked me to repeat ______ text ______ second time.
A. the; a B．a; the C．a; a D．the; the
The sand and dirt storm happened on ______ Monday and the children were at______ school．
A. ×; the B．a; × C．×; a D．the; ×
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