关于功率的概念,以下认识正确的是[ ] A.功率大的机器做功做的多 B.功率大的

题型:选择题

问题:

关于功率的概念,以下认识正确的是[ ]

A.功率大的机器做功做的多

B.功率大的机器在每秒钟内做的功多

C.由定义式P=W/t可知,t越小,P越大

D.由定义式P=W/t可知,W越小,P越大

考点:功率
题型:选择题

流态恶劣的险槽主要碍航因素为().

A、航道弯曲狭窄

B、流态坏、复杂

C、航道弯、窄、浅

D、A+B

题型:选择题

阅读理解。

     For the most part, you are probably only exposed to the music that is played on your favorite radio

stations and TV shows, music Web sites, or the music that your friends and family members enjoy. While

you probably know a lot about your favorite type of music, it can be a rewarding experience to enlarge

your horizons (眼界), discovering artists and types of music that you're not familiar with. Who knows,

you might discover you like certain types of music you never even considered.

     Have you ever wondered about the history and influences of your favorite types of music ? For

example, did you know that rock 'n' roll originated (起源) from the blues, and that the blues began as a

form of musical expression for African Americans during slavery (奴隶制度)? Did you know that most

hip-hop is heavily influenced by early rhythm blues and jazz ?

     There are many fun ways to learn about different musical styles and their historical roots. For example,

if you like hip-hop, listen to some of your favorite CDs and take note of the samples the performers used

to create the songs. There is a possibility that the artist used parts of older songs to create the music. You

can go to the library or online to learn more about the artists and listen to more of their music by checking out CDs from the library or downloading songs online for a small fee.

     You can learn so much about culture and history just by paying attention to different types of music

and what is being expressed in the songs. There are so many different styles of music to learn about, and

you owe(欠)it to yourself to make an effort to listen to and learn about them.

1. The main topic of this passage is _____.

A. creating music

B. performing music

C. enjoying your favorite music

D. learning about music

2. What music did African Americans use to express their feelings of being slaves ?

A. Rock 'n' roll.

B. The blues.

C. Hip-hop.

D. Jazz.

3. How can you learn about culture and history through music ?

A. By writing down the names of the music.

B. By creating music from older songs yourself.

C. By caring about what is being expressed in music.

D. By keeping a record of fees after downloading songs online.

4. By saying the underlined sentence in the last paragraph, the author probably means that _____.

A. you should try harder to learn about music

B. you should return something to music

C. you should borrow music CDs from others

D. you should buy music CDs yourself

题型:选择题

近代文学新的时代主题具体表现在哪些方面?

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下列食物中含钙最丰富的是()。

A.粮谷食物

B.瘦牛肉

C.鸡肉

D.牛奶

E.沙棘

题型:选择题

如果电源切断发生在将天然气回路置于大气压力下之后,LDU11装置()

A、执行中断程序

B、不影响正在执行的程序

C、程序器回到静止位置,密封检验程序从头重新启动

D、执行故障处理程序

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