若A=0~14岁人口数,B=15~64岁人口数,C=65岁及以上人口数,则总负担系数是
A.C/(A+B+
B.A/(A+B+
C.A/B
D.C/B
E.(A+/B
参考答案:E
用所给动词的适当形式填空。
1. He (enjoy) every year of junior high school.
2. Don't forget______ (close) the windows when you leave the classroom.
3. Would you please ____ (not sit) on the desk?
4. Mr Li _____ (teach) here since 1987.
5. He would never think of______(let) his daughter marry a fellow like you.
男性患者,32岁,有十二指肠球部溃疡病史8年,一天前出现柏油便。检查:贫血。其贫血的类型为()
A.大细胞性贫血
B.小细胞低色素性贫血
C.小细胞高色素性贫血
D.正细胞正色素性贫血
E.以上均不是