下列有关生态系统的叙述中,错误的是( ) A.绿色植物能通过光合作用制造有机物,

题型:选择题

问题:

下列有关生态系统的叙述中,错误的是(  )

A.绿色植物能通过光合作用制造有机物,因此,它属于生产者

B.阳光、空气和水都属于生态系统的组成部分

C.食物链和食物网一般由生产者、消费者和分解者共同形成

D.生态系统的物质和能量是沿着食物链和食物网流动的

考点:食物链和食物网生态系统的功能
题型:选择题

根据短文判断正(T)误(F)。

     Do you have a QQ number? Many people like to chat online using QQ. In fact, QQ has changed a large

number of Chinese people's communication habits (交流习惯). Do you know who invented QQ? It was Ma

Huateng.  

    Ma Huateng was born in 1971 in Guangdong. When he was very small, he showed a great interest in

astronomy (天文学). However, he chose to major in (学习…专业) computer science when he entered

Shenzhen University in 1989. In his eyes, computer science was closer to everyday life compared to astronomy. He worked hard and became the best student in his class.

     Ma worked as a computer programmer in a company in Shenzhen for five years after he graduated in1993.

His job was not bad and he could make a lot of money every month. However, Ma left the company and

started his own in 1998. It was difficult at the beginning and he had to work hard every day. After he invented

QQ, his business got better and better. It is said that now there are at least two hundred million people using

QQ. It is a wonder that even he himself never predicted (预测).

( )1. QQ is a common way for many Chinese people to communicate (交往) with each other.  

( )2. Ma Huateng became interested in compu ter science when he was young.               

( )3. Ma Huateng thought astronomy was closer to people's life than computer science.    

( )4. It was difficult when he started his own company.                                  

( )5. He predicted that there would be hundred million people using QQ from the beginning.

题型:选择题

人工定额中的定额时间包括( )。

A.工人下班前对搅拌机进行清洗的时间

B.工人由于施工工艺原因必需的中断时间

C.由于设计错误造成的工人窝工时间

D.由于施工机械故障造成的工人窝工时间

E.工人必需的休息时间

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赵阿姨每分钟打108个字,一篇文稿她大约用15分钟上打完,这篇文稿有多少个字?

题型:选择题

温度0℃就是没有温度。 [ ]

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波长λ=550nm(1nm=10-9m)的单色光垂直入射于光栅常数d=2×10-4cm的平面衍射光栅上,可能观察到光谱线的最大级次为:()

A.2

B.3

C.4

D.5

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