皮皮学，免费搜题
登录
搜题
【单选题】
把动力装置分散安装在每节车厢上,使其既具有牵引动力,又可以载客,这样的客车车厢叫做动车。而动车组是几节自带动力的车厢 ( 动车 ) 加几节不带动力的车厢 ( 也叫拖车 ) 编成一组。假设动车组运行过程中受到的阻力与其所受重力成正比,每节动车与拖 车的质量都相等,每节动车的额定功率都相等。若 2 节动 6 节拖车编成的动车组的最大速度为 120 km/h ,则 9 节动 3 节拖车编成的动车组的最大速度为 ( )A.
120 km/h
B.
240 km/h
C.
360 km/h
D.
480 km/h
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】Which of the following is not the views of Americans upon time?
A.
All of us are slaves to time.
B.
Time is a precious resource.
C.
Time is a circle, you can come to where you were.
D.
Time is like the sand in the hourglass.
【单选题】Which of the following is NOT the views of Americans upon time?
A.
All of us are slaves to time.
B.
Time is a precious resource.
C.
Time is a circle, you can come to where you were.
D.
Time is like the sand in the hourglass.
【简答题】Once upon a time there was a little boy who became very ill.He had to spend all day in bed, unable to ____.Because other children weren't allowed to come near him, he ____ greatly, and spent his days ...
【简答题】Once upon a time there was a ______ who had a beautiful ball. 2.The ball was ________ like the sun. 3.The princess didn’t want to play with the _______ frog. 4.The frog wanted to _______ after drinkin...
【简答题】Once upon a time there lived a poor farmer called Smith. He didn't like to share things with others. Smith had a friend who was famous for the wonderful apples he grew. One day, his friend gave Smith ...
【简答题】Once upon time, a man taught some monkeys how to dance. The monkeys were 16 clever that they began to dance well very soon. The man was happy. He 17 the monkeys up in special clothes and masks(面具). Th...
【单选题】Once upon a time a poor farmer taking a sack of wheat to the mill did not know 【C1】______ to do when it slipped from his horse and fell 【C2】______ the road. The sack was 【C3】______ heavy for him to 【C...
A.
how
B.
what
C.
which
D.
whether
相关题目：
参考解析：
知识点：
题目纠错 0
发布
