通气方法
参考答案：
打孔、划条和刺孔、垂直修剪、松耙。
He's one of those early birds. It's __________ of him to get up early. [ ]
A. practical
B. humorous
C. rude
D. typical
骨软骨瘤突然生长加快，X线片示在瘤体边缘有模糊不清的棉絮状钙化阴影，对其治疗应采用（）
A.观察
B.肿瘤切除术
C.局部广泛切除或截肢
D.放射疗法
E.化学疗法
