题干

(一)材料是人类赖以生存的重要物质基础.材料种类很多,通常可分为金属材料、无机非金属材料(包括硅酸盐材料)、高分子合成材料及复合材料.

(1)合金是被广泛应用的金属材料.

①下列有关合金性质的说法正确的是____ (填字母).

A.合金的熔点一般比它的成分金属高  

B.合金的硬度一般比它的成分金属低

C.组成合金的元素种类相同,合金的性能就一定相同

D.合金与各成分金属相比,具有许多优良的物理、化学或机械性能

②钢属于____ (填“铁合金”或“铝合金”).

③铁锈蚀主要发生的是电化学腐蚀,其负极反应式为____ .

(2)无机非金属材料包括玻璃、水泥和____ .

(3)合成塑料、合成橡胶和____ 是常说的三大合成材料.下列属于塑料制品的是____ (填字母).

A.汽车轮胎     B.涤纶      C.聚乙烯制品       D.玻璃钢

(二)(1)维生素是参与生物生长发育和新陈代谢所必需的一类小分子有机化合物;我们所熟悉的维生素有A、B、C、D、E等.其中维生素C又称____;人体自身不能合成维生素C;上述五种维生素中,属于水溶性维生素的是____ .

(2)某同学一天的食谱为:米饭、烙饼、豆腐、鸡蛋、糖醋排骨、酱牛肉.你认为这位同学还应该吃一些____ 食物,营养才算平衡.

(3)人们熟知的一种感冒药阿司匹林的结构式为:

请你写出其中含有的一种官能团的名称____

(三)汽车尾气(含有烃类.CO.SO2与NO等物质)是城市的污染源.治理的方法之一是在汽车的排气管上装一个“催化转换器”(用铂.钯合金作催化剂).它的特点是使CO与NO反应,生成无毒气体,并促使烃类充分燃烧及SO2的氧化.写出NO分别与CO、SO2反应的化学方程式: ____  , ____  .

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答案(点此获取答案解析)

D,\u94c1\u5408\u91d1,Fe\ufe632e\ufe63=Fe2+,\u9676\u74f7,\u5408\u6210\u7ea4\u7ef4,C,\u6297\u574f\u8840\u9178,\u7ef4\u751f\u7d20B\u3001\u7ef4\u751f\u7d20C,\u852c\u83dc\u3001\u6c34\u679c,\u7fa7\u9178,2CO+2NO2CO

同类题4

A

                                                                                    The Boy Made It!         

         One Sunday, Nicholas, a teenager, went skiing at Sugarloaf Mountain in Maine. In the early afternoon, when he was planning to go home, a fierce snowstorm swept into the area. Unable to see far, he accidentally turned off the path. Before he knew it, Nicholas was lost, all alone! He didn’t have food, water, a phone, or other supplies. He was getting colder by the minute.
           Nicholas had no idea where he was. He tried not to panic. He thought about all the survival shows he had watched on TV.It was time to put the tips he had learned to use.
       He decided to stop skiing. There was a better chance of someone finding him if he stayed put. The first thing he did was to find shelter form the freezing wind and snow. If he didn’t, his body temperature would get very low, which could quickly kill him. Using his skis, Nicholas built a snow cave. He gathered a huge mass of snow and dug out a hole in the middle. Then he piled branches on
 top of himself, like a blanket, to stay as warm as he could.
           By that evening, Nicholas was really hungry. He ate snow and drank water from a nearby stream so that his body wouldn’t lose too much water. Not knowing how much longer he could last, Nicholas did the only thing he could- he huddled(蜷缩) in his cave and slept.
The next day, Nicholas went out to look for help, but he couldn’t find anyone. He followed his tracks and returned to the snow cave,because
 without shelter, he could die that night. On Tuesday, Nicholas went out to find help. He  had   walked for about a mile when a volunteer
 searcher found him. After two days stuck in the snow, Nicholas was saved.
           Nicholas mightnot have survived this snowstorm had it not been for TV. He had often watchedGrylls’ survival show. Man vs. Wild. That's where he learned the tips that saved his life, In each episode(一期节目)of Man vs. Wild, Grylls is abandoned in a wild area and has to find his way out.
          When Grylls heard about Nicholas’ amazing deeds, he was super impressed that Nicholas had made it since he knew better than anyone how hard Nicholas had to work to stay alive.