不是宫内节育器放置禁忌证的是
A．月经稀发
B．生殖道急慢性炎症
C．生殖器官肿瘤
D．宫颈内口松弛
E．子宫畸形
参考答案：A
When I got home, my parents _____ for about an hour.[ ]
A. has got back
B. has gone back
C. had come back
D. had been back
( )的直接后果是使方案经济效果的实际值与评价值相偏离。
A．定量性B．确定性C．敏感性D．不确定性
