反映左心室收缩功能最常用的指标是（）。 A.心脏指数 B.心排出量 C.射血分数 D

词汇运用。

1. Jack, a friend of ________ (they), went to Canada for a visit last week.

2.There _________ (be) great changes in my hometown in the last twenty years.

3. Please write down all the _________ (guest) names on this piece of paper.

4. Bid flu is a serious _________ (ill) for human beings. We must stop it from happening.

5. Neither of the little girls _________ (visit) the museum at this time yesterday.

6. They got together to celebrate his grandfather's _________ (ninety) birthday.

7. Eating green food today can make us ________ than (healthy) before.

8. The number of the students is 4000, ________ (most), they are Germans.

9. How ________ (proud) they looked after they won the game!

10. The girl with long hair _________ (choose) to be our captain last term.

新生儿用物准备，不正确的是()

A．新生儿衣物宜柔软、宽大

B．衣缝在正面防止摩擦新生儿的皮肤

C．尿布宜用质地柔软、吸水、透气性好的纯棉织品

D．均需准备奶瓶、奶粉

E．洗涤用品要求柔和无刺激性

学科活动有别于幼儿自发生活的一个重要方面是（）

A.帮助幼儿形成简单、初步的概念

B.使幼儿能运用符号进行学习

C.让幼儿掌握严格的学科内在逻辑组织

D.使幼儿学会做事的计划性

冲天炉内脱硫可以加入（）

A.石灰石

B.电石

C.白云石

分析影响分梳作用的因素？