妊娠期血容量增加，产后恢复至未孕状态所需的时间是（） A.1～2周 B.3～4周 C

读短文，判断正(T)误(F)。

      Guangzhou is a beautiful city. It's not cold in winter (冬天). We can wear jackets. It's hot in summer. We

often swim in the swimming pool (游泳池). We can see many tall buildings in Guangzhou. There are many

flowers and trees everywhere. There are many cars on the road. There are many big parks, too. The air is fresh

in the park. Many people come here on the weekends. It's a nice place.

( ) 1. Guangzhou is a small city.

( ) 2. We often wear jackets in winter.

( ) 3. There are many tall buildings in Guangzhou.

( ) 4. We often swim in the river.

( ) 5. There are many people in the park on Saturdays and Sundays.

在平面直角坐标系xOy中，抛物线C的顶点在原点，焦点F的坐标为(1，0)．

(Ⅰ)求抛物线C的标准方程；

(Ⅱ)设M，N是抛物线C的准线上的两个动点，且它们的纵坐标之积为-4，直线MO，NO与抛物线的交点分别为点A，B，求证：动直线AB恒过一个定点。

一个三角形被任意一边上的中线分成两个三角形，则这两个三角形：①形状相同；②面积相同；③全等，上述说法中正确的有[ ]

A.0个

B.1个

C.2个

D.3个

某水厂的水源水总大肠菌群为8700cfu/ L，其他项目符合《生活饮用水卫生标准》的要求

A．该水源不符合《生活饮用水卫生标准》的要求

B．该水源必须经沉淀、过滤和消毒处理后才可以作为生活饮用水供给

C．该水源可只经消毒处理后作为生活饮用水供给

D．该水源不能作为生活饮用水

E．以上都不对

烈士褒扬社会工作的主要内容不包括( )。

A．协调烈属与陵园的纠纷

B．策划有针对性的宣传纪念活动

C．协助烈士遗物史料的收集

D．积极推进社会政策的良性改变