试题与答案

有A、B两种烃,其相关信息如下 A①完全燃烧的产物中n(CO2):n(H2O)=

题型:问答题

题目:

有A、B两种烃,其相关信息如下

A①完全燃烧的产物中n(CO2):n(H2O)=2:1

②28<M(A)<60

③不能使溴的四氯化碳溶液褪色

④一氯代物只有一种结构

⑤碳碳之间都是单键

B①饱和链烃,通常情况下呈气态

②有同分异构体

③二溴代物有三种

回答下列问题:(1)烃A的最简式是______;   (2)烃A的结构简式是______.

(3)烃B的三种二溴代物的结构简式为______;

(4)烃C为烃B的同系物,常温下为气态且只有一种一溴代物,则烃C的一溴代物的结构简式为______ (填一种即可).

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A, D, E

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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. save B. consume C. produce D. control

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