For the first time, this island of Greece had its own fresh water. Women could fill their pails with all the water they wanted! Very little rain falls on Symi. The people have always saved every drop they could get. But it has never been enough for their needs. They have had to buy...
Using electric current and inexpensive synthetic plastic membrane, saline water is converted to fresh water without using any heat or chemicals. Two-thirds of the water comes out fresh; the other third has the salt and other chemicals, among them magnesium...
Scientists have found some ways to turn salt water into fresh water. One important way is to boil sea water with high heat until vapor rises, leaving the salt. In this way, a lot of fresh water can be made quickly. 正在翻译,请等待...[translate]...
1, salt water which has been precooled by heat exchange with either fresh water or concentrated salt water resulting from the process enters a freezing zone 2 of the apparatus through a pipe 1. A liquid refrigerant which is immiscible with water is fed into the freezing zone through a pipe...
文章第一段最后一句: 'people are trying their best to find more ways to get fresh water.' 人类正尽全力找寻获取纯净水的方法,由此推断因该是因为水资源的短缺,所以才需要找到方法。故选B (2) 细节理解题。根据文章第一段最后一句: 'people are trying their best to find more ways to get fresh ...
根据Scientists have found some ways to turn salt water into fresh water.和People also have other ways, such as digging deep wells, keeping rainwater and protecting rivers from being polluted.可知,本文共提到四种获得淡水的方法。故选D。 啊啊 通读全文可知,本文主要讲述地球越来越缺乏淡水,文中提到了...
But heating is not the only way to get fresh water from salt water. Other ways are tried. One way is freezing (冷冻). The fresh part of salt water freezes first. To get fresh water,the pieces of ice are taken out. Which way is the best? The one that gives the most water for th...
or use the rest which comes from rivers,lakes and the underground.The number of people in the world is becoming larger and larger,so we need more and more fresh water.Now water shortage (短缺) becomes a big problem.And people are trying their best to find more ways to get fresh water....
Many places in the world need more fresh water. Every country is trying to find ways to turn salt water into fresh. Why aren't there many factories like the Symi factory? In some places, the sun isn't hot enough, or it doesn't shine every day. In these places, other ways of heati...
Many places in the world need more fresh water. Every country is trying to find ways to turn salt water into fresh. Why aren’t there many factories like the Symi(锡米岛) factory? In some places, the sun is not hot enough. Or it does not shine every day. In such places, other wa...