患者男，35岁。左下颌下区被拳击伤，随即伤区出现肿胀、瘀斑；扪诊有波动感，张口度及咬

控制噪声的传播途径可归纳为“隔、吸、消”．“隔”就是把噪声与接收者隔离开来．“吸”就是把声能吸收耗散掉，达到减噪目的．最常用的吸音材料是多孔性材料．它的机理是让声波进入后，在吸音材料的微孔中发生摩擦而将声音的能量消耗掉．利用吸声材料还可以制造消声器．消声器主要用来消除气流噪声．如汽车、摩托下面排气吐烟的管子上有-段粗些的管子，就是一种消声器．

请你根据学过的有关声现象的物理知识，设计一个简易实验探究控制噪声的方法．

（1）写出选取用的器材：

（2）实验的主要步骤：

在建设单位销售物业之前，（）是唯一的业主。

A.物业管理企业

B.物业买受人

C.物业服务企业

D.建设单位

（1）某工厂实验室技术人员煅烧l00g石灰石样品，完全反应后，冷却到反应前的温度，称得残余固体的质量为62.6g．根据______定律，生成二氧化碳气体的质量为______g．

（2）某兴趣小组利用废旧铝制品与氢氧化钠溶液反应制取氢气，现用80g 20%的氢氧化钠溶液和足量的废旧铝制品完全反应（氢氧化钠溶液与杂质不反应），理论上可制得氢气多少克？（反应的化学方程式为：2Al+2NaOH+2H₂O═2NaAlO₂+3H₂↑）

B

As a result of pollution, Lake Erie, on the borders of the USA and Canada, is now without any living things.

Pollution in water is not simply a matter of “poisons” killing large numbers of fish overnight, Very often the effects of pollution are not noticed for many months or years because the first organisms（生物体）to be affected are either plants or plankton(浮游生物). But these organisms are the food of fish and birds and other creatures. When this food disappears, the fish and birds die too. In this way a whole food chain can be wiped out, and it’s not until dead fish and water birds are seen at the river’s edge or on the seashore that people realize what is happening.

　　Where do the substances which pollute the water come from? There are two main sources of sewage（下水道污物）and industrial waste. As more detergent（洗涤剂）is used in the home, so more of it is finally put into our rivers, lakes and seas. Detergents harm water birds, dissolving the natural substances which keep their feathers water-proof (防水). Sewage itself, if not properly treated, makes the water dirty and prevents all forms of life in rivers and the sea from receiving the oxygen they need. Industrial waste is even more harmful as there are many highly poisonous things in it, such as copper and lead.

　　So, if we want to stop this pollution, the answer is simple: sewage and industrial waste must be made clear before flowing into the water. It may already be too late to save some rivers and lakes, but others can still be saved if the correct action is taken at once.

70. Pollution of water is noticed________.

　　A. when the first organisms are affected　     

B. when a good many fish and birds die

　　C. when poisonous things are poured into water　

D. as soon as the balance of nature is destroyed

71.The living things die because there is no ________in the lake or river.

　　A. water　　　　　            B. fish           　 C. poison　　　　　  D. oxygen

72. Which of the following is harmful according to the passage?

　　A. Organisms              　B. Plants and plankton in the water

　　C. Waste water from cleaning    D. Industrial waste made clear before flowing into the water

73. The way to stop water pollution is to________.

　　A. realize the serious situation clearly

　　B. put oxygen into the river

　　C. make the waste material harmless before flowing into the water

　　D. make special room in the sea for our rubbish

手术进行中的无菌原则有()

A．手术台边缘以下的布单不能接触

B．切开肠腔前应先用纱布垫保护好

C．无菌区布单沾湿时应加盖无菌巾

D．缝皮肤前须用碘酊、酒精消毒

E．手套破了用碘酊、酒精消毒手指