搜题请搜索小程序“爱下问搜题”
问题 选择题

对于反应3Cl2+6NaOH═5NaCl+NaClO3+3H2O，以下叙述正确的是（　　）

A．Cl2是氧化剂，NaOH是还原剂

B．被氧化的Cl原子和被还原的Cl原子的物质的量的比为5：1

C．Cl2既是氧化剂又是还原剂

D．每生成1mol的NaClO3转移6mol的电子

答案

答案：C

填空题 案例分析题

下图为普通小麦（异源六倍体）的形成过程示意图。据材料分析有关问题：

 

在A、C（染色体数目加倍）过程中常用的化学方法：（）；
查看答案
填空题

Recycling Paper


The process of recycling paper can help to reduce deforestation and energy consumption on a significant scale. There are many different reasons why we should recycle paper products, and some of these are (26) in the paragraphs below.
Energy consumption will always be on the (27) as population levels grow, and so any manufacturing processes which help to reduce energy consumption are (28)
The Energy Information Administration (EIA) claim that there can be as (29) as a 40% energy saving when recycling paper over producing paper (30) the direct raw material.
Although recycling paper has many (31) , it also has its drawbacks. One of these drawbacks is that we cannot recycle the (32) paper product for eternity, as the fibers contained within the paper degrade over time, (33) their strength and length.
On (34) , an individual paper fiber can only be recycled a (35) of six times. Although this is a significant drawback, the six time recycling process will help to (36) a great deal of energy when you consider (37) much paper there is to be recycled.
If paper fibers can be recycled up to 6 times, and we recycled all paper products, this could help to (38) the intensity of deforestation for paper products up to a factor of 6.
With paper production said to (39) around 40% of harvested wood, and paper said to (40) around 90% wood, you can see how recycling paper is an important process for the (41) of our forests.
Today, the use of recycled paper products is on the increase, as more and more people begin to recycle paper (42) products around the home.
Although there are slight differences in the recycling processes of different (43) of paper products (e.g. corrugated, mixed paper, newspaper products), we are able to recycle just about any type of paper product around today.
The recycling logo helps to (44) a recyclable product and can also sometimes help to identify if the product contains any recycled material, in the form of a percentage. This helps a consumer to identify the (45) of recycling various products.

A. fall B. rise C. top D. surface
查看答案