妊娠期, * * 少量下血,时下时止,无腰酸腹痛,恶心,时有呕吐,神疲肢倦,气短懒言,中医诊断为:()
A.胎动不安
B.堕胎
C.恶阻
D.胎漏
E.滑胎
参考答案:D
_____ room is very clean and tidy. [ ]
A. Jim's and David's
B. Jim and David's
C. Jim's and David
D. Jim and David
简述圆盘造球机立轴损坏的原因和预防措施?