1988年WHO建议下提出的TBS报告系统对宫颈病变共分()。
A.3个
B.4个
C.5个
D.6个
E.7个
参考答案:A
—Have you ever been to Tibet?
—Yes, I ______ there last year. [ ]
A. have gone
B. have been
C. went
绝缘杆的试验周期为()
A、三个月
B、六个月
C、一年