流产的主要症状是()
A. * * 流血和腹痛
B.尿妊娠试验阴性
C.子宫与孕周相等
D.宫颈扩张
E.妊娠反应消失
参考答案:A
The old man came _____ to the railway station, only _____ the train was slowly pulling out of the station. [ ]
A. and ran; found
B. running; finding
C. running; to find
D. to run; finding
飞行中测出DA—10°,TKE—3°,说明偏流修正().
A.过大
B.过小
C.正确