治疗慢性硬膜下血肿最常用的手术方法是（）
A.开颅血肿清除术
B.脑室外引流术
C.去骨瓣减压术
D.钻孔引流术
参考答案：D
He always brings me a pretty gift ____ he comes to visit me. [ ]
A. by the time
B. sometimes
C. every time
D. at times
救灾款物的使用范围有哪些？
