下列滤镜中（）属于纹理滤镜。 A.颗粒 B.等高线 C.画笔描边 D.拼贴滤镜 E.

关于顶棚基层的说法不正确的是( )。

A．顶棚基层即顶棚骨架层，是一个包括由主龙骨、次龙骨所形成的网格骨架体系

B．顶棚基层的作用主要是承受顶棚的荷载，并由它将这一荷载通过吊筋传递给楼盖或屋顶的承重结构

C．常用的顶棚基层有木基层及金属基层两大类，即木龙骨和金属龙骨

D．金属龙骨包括轻钢龙骨和铝合金龙骨

城市土地的使用模式中，提出同心圆城市理论的是（）。

A．B·W·伯吉斯

B．H·霍伊特

C．克里斯泰勒

D．乌曼

读写任务。

阅读下面的短文，然后按照要求写一篇150 词左右的英语短文。

        A grand memorial service was held Wednesday ，October 28, 2009. in central Hubei Province to

honor three college students who died rescuing two children from the Yangtze River on October 24.

Thousands of people holding chrysanthemum flowers went to the Jingzhou Memorial House to see off the

teenagers, all 19-year-old students from the Yangtze University based in Jingzhou City.

        The trio were Chen Jishi, He Dongxu and Fang Zhao. More than 10 students from the Yangtze

University formed a ladder with one student holding another's arms to rescue the two boys in the river on

the afternoon of October 24. One of the students lost his grip on his classmates and all of them were in

danger. Several members of a winter swimming team nearby came to help. Chen Jishi, He Dongxu and

Fang Zhao were swept away in the torrent, but others were saved. People touched by their selfless act had

donated more than 500,000 yuan ($73,206) to their relatives as of Wednesday, Zhang said. Millions of

Internet users made online comments on major news portals to show their grief.

        "I am also a college student. I feel sorrow for you," said "Liu Zhuoya," from northwestern Xi'an City.

However, some questioned the sacrifice. "Sacrifice three and rescue two, is that worthwhile?" asked "Tiao

zhantianya" on the forum of www.163.com. "Rescue can not be blind as they could not swim."

        写作内容：

        1.以约30个词概括短文的内容要点；

        2.以约120个词就？，内容包括：

        (1)当别人有难时，你是否会马上伸出援手？为什么？

        (2)救人时是否要考虑自身的安全？（可以举例说明）

        (3)假如你当时在场，你会怎样做？

        [写作要求]

        1. 可以使用实例或其他论述方法支持你的论点，也可以参照阅读材料的内容，但不得引用原文中的句子；

        2. 文中不能出现真实姓名和学校名称。

        [评分标准]概括准确，语言规范，内容合适，篇章连贯。

X射线机中烟花形状、尺寸、颜色各异，图像特征也不尽相同，内部含有火药，火药在图像中通常（），有些烟花火药内含有（）。

A、呈绿色

B、淡绿色

C、金属物质

D、金属颗粒

输送带在运行时为什么会跑偏？跑偏时应如何调整？如何防止跑偏？