卫生服务调查的主要内容有哪些？
合作。
When BGP tuning is used， how is packet flow into the e-commerce module controlled？（） ["by tracking the status of objects along the path to the e-commerce module","by detecting undesirable conditions along the path to the e-commerce module","by using the MED to communicate the site preferences for traffic to multiple ISPs","by communicating the available prefixes， routing policies， and preferences of each site to its ISP","by moving the SLB to a position where selected traffic to and from the servers does not go through the SLB"]
某初产妇，27岁，停经31周，因阴道流血1天收入院。患者于1日前无明显诱因出现阴道流血，量较多，无腹痛。入院检查：血压120/70mmHg，尿蛋白（-），下肢水肿（-），血色素82g/L。B超提示胎盘位于子宫右后壁延至前壁覆盖官颈内口。该孕妇目前收入院观察。
列出2个主要的护理问题。
放线时，越线架与公路的最小垂直距离为（）m。 ["4","5","5.5","6"]
寿命表的基本思想是什么？
