A.有形磨损B.无形磨损C.自然磨损D.物理磨损
单项选择题A.Level Two course beginning on Saturday in October． B.Full time courses taken in evenings． C.An 8-month course two nights a week． D.Intensive course on every Saturday and Sunday．
多项选择题子宫位置的维持依靠（）
A.肛提肌B.会阴中心腱C.子宫诸韧带D.尿生殖膈E.闭孔内肌
