纵隔肿瘤定位诊断最佳方法是()
A.胸部正侧位片
B.体层
C.血管造影
D.支气管造影
E.CT
参考答案:E
-- Who’s ____________ young man next to Miss Lin?
-- Oh! He is ___________new teacher. You see there are many new teachers in our school this term.
A. the; the B. the; a C. a; a
能提高零件的疲劳强度是()。
A.设计时改变零件结合的位置
B.加工时改善表面粗糙度
C.加工时采用表面处理、滚压和喷丸等措施
D.设计时改变零件结构的形状