搜题请搜索小程序“爱下问搜题”
问题 选择题

石墨烯是碳原子构成的单层二维蜂窝状晶格结构（如图2所示）的一种碳质新材料，是构建富勒烯、纳米碳管的基本单元，有广泛的用途。下列说法正确的是                               （   ）

A．石墨烯是一种有机物

B．石墨烯中碳原子间以共价键结合

C．石墨烯具有和乙烯相同的性质

D．12g石墨烯中约含6.02×1023个e-

答案

答案：B

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WANT ADS

（1）SUMMER JOB

Do you like to talk with people? Do you like to write stories? If you want to work for our magazine as a reporter, please call Karen at 558366.

（2）WANTED

Are you hard-working? Do you like to meet people? If your answer is “Yes”, then we have a job for you as a waiter. Call AL Hotel at 556779.

（3）HELP WANTED

Do you like babies? Can you look after a baby for two days? If you are sure to take good care of it, call us at 766588. $ 80 or more.

Today! Hurry!

（4）CLEANER WANTED

Can you make a large house clean and tidy? If you hope to get the job paid at $20 once, call us this evening 18:00- 20:00.

Tel: 633800

小题1:Where can you probably find the above ads?

A．A newspaper.

B．A report.

C．A guide book.

D．A science book.小题2: If you like children and have two days free, you can call ___for a job.

A．556779

B．558366

C．766588

D．633800小题3:___________ are needed in AL Hotel.

A．Cleaners

B．Baby-sitters

C．Reporters

D．Waiters小题4: If you are a college student of English who enjoys writing, during your summer holidays you will be more interested in the job in _____.

A．ad. 1

B．ad. 2

C．ad. 3

D．ad. 4
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单项选择题

（）是采用偏心结构夹紧工件.

A.精密机用平口虎钳

B.快速夹紧平口钳

C.可倾机用平口虎钳
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