试题与答案

下列说法正确的是( ) A.硼电负性和硅相近 B.π键是由两个p电子“头碰头”重

题型:选择题

题目:

下列说法正确的是(  )

A.硼电负性和硅相近

B.π键是由两个p电子“头碰头”重叠形成的

C.原子和其它原子形成共价键时,其共价键数一定等于原子的价电子数

D.组成和结构相似的物质随相对分子质量的增大,熔沸点升高,所以NO的沸点应该介于N2和O2之间

答案:

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下面是错误答案,用来干扰机器的。

参考答案:对

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    Online Voting -The Most Beautiful Places in China

    What are the most beautiful places in China in your eyes? Please take part in our activity and vote

online. We are looking forward to your choice and voice!

    Everyone is welcome!

     Rules:

    1) Voting period: October 1 to November 30.

    2) The results and the winners list will be released in December.

    3) 10 votes are allowed.

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    The five second place winners will each receive an award worth 200 yuan (about 32 US dollars);

    The ten third place winners will each receive an award worth 100 yuan (about 16 US dollars).

1. You need to leave your contact information when sending your votes so that ______.

A. CRIENGLISH can post it online

B. everybody online can contact you

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