试题与答案

电缆支架最上层至电缆夹层的最小允许净距离（）mm。

来源：www.tikuol.com
题型：填空题

题目：

电缆支架最上层至电缆夹层的最小允许净距离（）mm。

答案：

被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0514/830ef55d56866697c125dcdb1027380d.html

下面是错误答案，用来干扰机器的。

参考答案：A

考点：工厂建筑供配电工厂建筑供配电题库
试题推荐
题型：阅读理解与欣赏

阅读下面的文字，完成问题。

奇妙的眼睛

　　①看一看蝴蝶，你会看见它那美丽的形状和色彩，你会注意到它翅膀上的线条和斑点，你甚至会看见蒙在它翅膀上，使翅膀色彩斑斓的那层细细的粉末，还会看到它那圆溜溜发亮的黑眼睛。

　　②透过这双眼睛，在蝴蝶看采你是什么样的呢？一点儿也不像你在镜子里看到的自己那副模样！

　　③蝴蝶只看见它所需要看见的东西。它把你的脑袋只认作是它休息的一个地方，你的头发像一堆乱绳子，每根都粗得足以让它的脚在上面站得住。蝴蝶只有在它飞行时或你在行动时才能看见你，因为它只能看到运动的物体。

　　④你的眼睛能自己运动，细小的肌肉一直在使你的眼睛上下、前后地运动。但是蝴蝶和其他昆虫的眼睛相对于头部来说是不动的，青蛙、蟾蜍和有些鱼的眼睛也是不动的。

　　⑤色彩能帮助你看见东西，但是能看得见颜色的哺乳动物只有人和某些猿。在其他哺乳动物（比如狗）看来，世界就像一张黑白照片。狗在打猎时主要依靠听觉和嗅觉。

　　⑥鸟确实看得见颜色3它们需要看得见颜色，因为它们飞在空中，需要寻找栖息的地方。色彩帮助它们判断距离和形状，这样它们才能在空中抓到虫子或者在树枝上落下。有些乌看东西甚至比你还厉害。吃昆虫的乌可以在很远的地方就看见虫子，甚至非常幼小的鸟都能看见高空中的鹰鹫。敏锐的目光和色感有助于鸟类寻找食物，发现敌人。

　　⑦动物眼睛的形状同它自身的需要相适应。马眼睛的瞳孔（即眼的开口）长得横里宽，野马一般生活在开阔的平川地上，宽的瞳孔使这些野马看见左右两边远处的敌人。猫和狐狸的瞳孔长得竖里长。这些动物更需要看上下的东西——灌木丛里的鸟，草丛里的老鼠。更为特殊的是四眼鱼的眼睛，这种鱼生活在水的最上层。宅的眼睛分成两半，上面一半看空中，下面一半看水里。所以四眼鱼能同时看到下面的鱼，上面的鸟，而且都在一幅画面里！

　　⑧我们目前所了解的就已经使我们惊叹不已。而科学家们将对动物看东西的许多办法了解得越来越多。（文章有删节）

1．从全文来看，动物眼睛的“奇妙”表现在哪些方面？

_______________________________________________________

2．请你说出文中所使用的一种说明方法，并结合具体内容说明其作用？

_______________________________________________________

3．请说说第④段中加粗的“相对于”在句子中的作用？

_______________________________________________________

4．请你说出第⑦段的结构方式。

_______________________________________________________
查看答案
题型：单项选择题

下面程序的结果是（ ）。　　　#include＜iostream．h＞　　　class test{ private：　　　　　　　　　int num；　　　　　　　public：　　　　　　　　test( )；　　　　　　　　int getint( ) {return num；}　　　　　　　　～test( )；}；　　　test：：test( )　　　{ num=0；}　　　test：：～test( )　　　{ cout＜＜"Destructor is active"＜＜endl；}　　　void main( )　　　{ test x[3]；　　　　　cout＜＜"Exiting main"＜＜endl；}

A． Exiting main　　Destructor is active　　Destructor is active　　Destructor is active

B． Exiting main　　Destructor is active　　Destructoris active

C． Exiting main　　Destructoris active

D．Exiting main
查看答案
题型：单项选择题


Smallpox was the first widespread disease to be eliminated by human intervention. A highly contagious viral disease, it was endemic in Europe, causing the death of millions of people until the development of vaccination by Edward Jenner around 1800. In many non- European nations, it remained a dreaded, often fatal illness until very recently.
In May 1966, the World Health Organization (WHO), an agency of the United Nations, was authorized to initiate a global campaign to eradicate smallpox. The goal was to eliminate the disease in one decade. At the time, the disease posed a serious threat to people in thirty nations. More than 700 physicians, nurses, scientists, and other personnel from WHO joined about 200,000 health workers in the infected nations to battle the disease. Because similar projects for malaria and yellow fever had failed, few believed that smallpox could actually be eradicated, but eleven years after the initial organization of the campaign, no cases were reported in the field.
The strategy was not only to provide mass vaccinations but also to isolate patients with active smallpox in order to contain the spread of the disease and to break the chain of human transmission. Rewards for reporting smallpox assisted in motivating the public to aid health workers. One by one, each smallpox victim was sought out, removed from contact with others and treated. At the same time, the entire village where the victim had lived was vaccinated.
By April 1978, WHO officials announced that they had isolated the last known case of the disease, but health workers continued to search for new cases for two additional years to be completely sure. In May 1980, a formal statement was made to the global community. Today smallpox is no longer a threat to humanity. Routine vaccinations have been stopped worldwide.

It can be inferred from the passage that ______ .

A．malaria and yellow fever have been reported this year

B．no new cases of smallpox have been reported this year

C．smallpox victims no longer die when they contract the disease

D．smallpox is not transmitted from one person to another
查看答案
微信公众账号搜索答案