题目内容：
胎盘的功能有哪些?
参考答案：
选择题：胎盘的功能有哪些?
- 题目分类：河南医学高等专科学校-妇产科护理学
- 题目类型：选择题
- 查看权限：VIP
某初产妇，一般情况良好，胎儿足月，左枕前位，胎心140次/分，规律宫缩已17小时，宫口开大3cm，宫
某初产妇，一般情况良好，胎儿足月，左枕前位，胎心140次/分，规律宫缩已17小时，宫口开大3cm，宫缩较初期间歇时间长，约10-15分钟一次，持续31秒，宫缩高
17.Victor took a bus and headed for home, ____ if
17.Victor took a bus and headed for home, ____ if his wife would have him back.
18.He is keen to ____________ relations with this
18.He is keen to ____________ relations with this company because of its good r
35.Traditional as he is in his way of life, the el
35.Traditional as he is in his way of life, the elderly professor is more _____
在xy平面内有两根互相绝缘、分别通有电流和的长直导线，设两导线互相垂直（如图），则在xy平面内磁感应
在xy平面内有两根互相绝缘、分别通有电流和的长直导线，设两导线互相垂直（如图），则在xy平面内磁感应强度为零的点的轨迹方程为：_________________