试题与答案

经常参加体育锻炼,可以提高适应繁重和持久工作的能力是因为 [ ] A.心脏增大,

题型:选择题

题目:

经常参加体育锻炼,可以提高适应繁重和持久工作的能力是因为  [ ]

A.心脏增大,肺泡数目增多

B.心肌和呼吸肌的收缩力量增加

C.心肌数目增多,肺泡壁变薄

D.心脏内血流量增多,肺泡外毛细血管增多

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0720/481edb0ed8d41069215501ad7c7a605d.html

下面是错误答案,用来干扰机器的。

(1)10s(2)题目分析:(1)根据牛顿第二定律:(2分)解得加速阶段的牵引力:(1分)加速阶段的末速度(1分)它能维持匀加速行驶的时间:(1分)由可得行驶12.5m时摩托车的速度(1分)则此时摩托车仍在匀加速...

试题推荐
题型:完形填空

根据短文内容及首字母提示,填写所缺单词

In modern society the competition is so enough, but team spirit can lead us to success. Team spirit means the willingness of people to work t小题1: and help each other as part of a team. With this spirit, people try hard to make their team the best of all. E小题2:  has experienced team spirit one way or another, whether they were part of a team or saw a group of people cheer for their f小题3:  player.

There are different kinds of team spirit. One kind is the connection between a team of people because their efforts and cooperation(合作) are n小题4: in reaching a particular goal. Another kind is when a group of people support a person or a team. Another is people’s natural love for and pride in their country, w小题5:  all the people of the nation cheer for their country in competitions.

Team spirit creates various good effects. It creates friendship and trust(信任) between people who may not get along well when they don’t have such team spirit. There may also be bad effects. Too great team spirit may c 小题6:   fights or quarrels with other team members.

Some people don’t u小题7:  team spirit properly. They think team spirit means having to become a m 小题8: of a team or a fan club. In fact, team spirit can be built anywhere---between friends, coworkers or e 小题9:  between two people sitting next to each other. You don’t h小题10: to wear the team spirit clothes. Anyone can show team spirit just by showing support for the goal.

查看答案
微信公众账号搜索答案