_______ she _______ a pen? [ ]
A. Does, has
B. Is, there
C. Does, have
D. Do, have
答案:C
男,67岁,咳嗽、痰中带血1个月,纤维支气管镜检查示左下肺腺癌,胸部CT示左下肺包块,右上纵隔淋巴结肿大,最佳的处理方式为()
A.左下肺叶切除术
B.术前电视胸腔镜检查
C.术前纵隔镜检查
D.术前经皮穿刺淋巴结活检
E.放化疗
简述交流发电机的基本结构。