下列分子的电子式书写正确的是( ) A.MgCl2 B.CCl4 C.C

题型:选择题

问题:

下列分子的电子式书写正确的是(  )

A.MgCl2

B.CCl4

C.CO2

D.Na2O

考点:电子式的书写
题型:选择题

2011年生产一件A商品的社会必要劳动时间为 8小时,价值80元,全社会A商品的产量为10万件。如果2012 年生产一件A商品的社会必要劳动时间缩短为4小时,那么,在其他条件不变的情况下,2012年A商品的全社会总产量、单位商品的价值量和社会价值总量分别是 

A.10万件、80元、800万元

B.10万件、40元、400万元

C.20万件、80元、1 600万元

D.20万件、40元、800万元

题型:选择题

We use an average of 158 liters of water a day in Britain, for which we pay a bargain price of 28p a liter, but much of this is just cash down the drain, according to water companies.

Most are campaigning to cut the amount we use. And the frontline weapon in their campaign is the water meter (计量器). They want us all to have one and one company is seeking powers to make this compulsory.

The Government is anxious for us to use less water, too. Elliot Morley, the Environment Minister, says he is impressed by the savings when a meter is installed. In most homes, consumption drops by 20 percent.

He also thinks consumers get a good deal from meters. He said, “Most people would find that they would either be exactly the same or better off with water meters and it is a fairer way of paying for water.”

At present, only 25% of households have meters and most of those are in East Anglia. They are installed by water companies, and households then have about £43 added to each bill to cover the cost of installing and reading the meter.

Barrie Clarke, a spokesman for Water UK, said, “We want everyone to be more water wise—to think about the amount of water they use. But with our climate change and different weather patterns, over time it will make economic and environmental sense to think how we use water. This may mean meters.”

Mr. Clarke believes the easiest way to save water is to use less in the garden. In one hour, a sprinkler uses the same amount of water as the average family of four uses in a day—about 632 liters. He said that gardeners should water in the evening so that it dose not evaporate in the heat of the day and that every household should have a water butt to collect rainwater for use in the garden.

小题1:Which of the following is NOT the advantage of installing water meters?

A.Water consumption drops.

B.It’s fairer to pay for water.

C.They’re installed for free.

D.People are more water wise.小题2:The passage implies that ________.

A.water meters are welcome by British people

B.people will be better off with water meters

C.everyone has become wiser to use water now

D.saving water is both good to economy and environment小题3:How many liters of water does an average family of four use in a day after installing a meter in Britain?

A.about 126 liters

B.about 158 liters

C.about 506 liters

D.about 632 liters小题4:The underlined word “evaporate” in the last paragraph means _________.

A.change into steam and disappears

B.absorb the heat of the day

C.sink into the soil

D.turn into ice小题5:According to Mr. Clarke, some good ways to save water are as follows EXCEPT ________.

A.using less on the garden

B.using a sprinkler

C.watering in the evening

D.gathering rainfall for garden use

题型:选择题

实现量值溯源的最主要的技术手段是( )。

A.校准

B.测量

C.计算

D.检定

E.检测

题型:选择题

某孕妇,末次月经为2003年5月10日,其预产期应为()

A.2004年2月17日

B.2004年2月24日

C.2004年3月17日

D.2004年3月24日

E.2004年1月17日

题型:选择题

“要抓好关键线路的进度控制”体现了建设工程进度控制的( )。

A.全过程控制
B.全方位控制
C.系统控制
D.动态控制

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