The factory has been ________ for two years.
A.open
B.to open
C.opening
D.opened
答案:A
该病例最可能的诊断是
A.子宫肌瘤蒂扭转
B.葡萄胎
C.卵巢肿瘤
D.子宫肌瘤肉瘤变
E.子宫肌瘤伴感染
简述ISDN用户-网络接口中“T”“S”“R”接口的含义。