某城市铁路车站的设计方案如图所示，进站和出站的轨道都与站台构_爱下问搜题

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问题问答题

某城市铁路车站的设计方案如图所示，进站和出站的轨道都与站台构成一个缓坡。从能量利用的角度看，这种设计的优点是什么？

答案

列车进站时，利用上坡使部分动能转化为重力势能，减小因刹车而损耗机械能；出站时，利用下坡将储存的重力势能又转化为动能，起节能作用。

完形填空

完形填空。
It was raining hard when Jenny planned to go out for shopping.She stayed at the door for 1 seconds and decided to 2 bus to the shopping center. To her surprise she 3 so many people at the bus stop and the buses 4. She didn’t know 5 . Another bus came and people crowded on at once. She didn’t feel like 6like that, and had to 7 the stop. She looked at the heavy rain and buses.The traffic was 8 at all, but was it possible to take a taxi? She thought.She looked 9 to see if there were taxis coming or going by. Maybe because of the bad weather, she didn’t even see a taxi. How bad she felt! Then she decided to go back home and spent her afternoon 10 TV at home.
( )1 A. few ( )2 A. by ( )3 A. found ( )4 A. crowded ( )5 A. to do ( )6 A. do ( )7 A. stand at ( )8 A. busy ( )9 A. one way ( )10 A. watch	B. a few B. on a B. heard B. were crowded B. to do what B. did B. wait for B. not busy B. the two ways B. watched	C. little C. take a C. looked at C. were crowding C. what to do C. to do C. stand C. heavy C. both ways C. to watch	D. a little D. take D. understood D. have crowded D. how to do D. doing D. wait D. much D. some ways D. watching

判断题

使用Millisecond选项时，时间线窗口和监视器窗口的节目窗口中使用的最后一组单位是音频采样率的单位，显示时间码为“00：00：00：000”。（）