问题 多项选择题

某装饰工程公司承担的室内装饰装修施工任务中,采取了先地面砖、吊顶后墙面漆,最后进行木地板铺贴的施工顺序。吊顶工程是一项工程量和施工难度较大的分项工程,因此,在施工中应做好吊顶工程的施工控制及质量验收工作。

在地面砖施工中,下列施工方法正确的是( )。

A.地面砖铺贴前应浸水湿润2小时

B.铺贴前应根据设计要求确定结合层砂浆厚度,拉十字线控制具厚度和地面砖表面平整度

C.结合层砂浆宜采用体积比为1:1的干硬性水泥砂浆,厚度宜高出实铺厚度2~3mm。铺贴前应在水泥砂浆上刷一道水灰比为1:3的素水泥浆

D.厨房地面砖铺贴时应与客厅地面砖施工方法相同。铺贴时应保持地面砖水平就位,用铁锤敲击使其与砂浆粘结紧密

E.铺贴后应及时清理表面,并用2:1水泥浆灌缝,选择与地面砖颜色一致的颜料与白水泥拌和均匀后嵌缝

答案

参考答案:A,B

阅读理解

阅读理解。

     The year is 2094.  It has been announced that a comet(彗星) is heading towards the Earth.  Most of

it will miss our planet,but two pieces will probably hit the southem half of the Earth.

     On 17 July,a piece four kilometers wide enters the Earth's atmosphere with a massive explosion. 

 About half of the piece is destroyed,but the remaining part hits the South Atlantic at 200 times the speed

of sound. The sea boils and a huge hole is made in the sea bed.  Huge waves are created and spread

outwards from the hole.  The wall of water,a kilometer high,rushes towards southem Africa at 800

kilometers an hour. Cities on the African coast are totally destroyed and millions of people are drowned.

     Before the waves reach South America,the second piece of the comet lands in Argentina.

Earthquakes and volcanoes are set off in the Andes Mountains.  The shock waves move north into

California and all around the Pacific Ocean.The cities of Los Angeles,San Francisco and Tokyo are

completely destroyed by earthquakes.  Millions of people in the southem half of the earth are already

dead,but the north won't escape for long.  Because of the explosions,the sun is hidden by clouds of dust,

temperatures around the world fall to almost zero. Crops are ruined.  The sun won't be seen again for

many years. Wars break out as countries fight for food.  A year later,no more than 10 million people

remain alive.

     Could it really happen? In fact,it has already happened more than once in the history of the Earth. The

dinosaurs were on the Earth for over 160 million years.  Then 65 million years ago they suddenly

disappeared.  Many scientists believe that the Earth was hit by a piece of object in space.  The dinosaurs

couldn't live through the cold climate that followed and they died out. Will we meet the same end?

1. What is mainly described in the passage?

A.  A historic discovery.                  

B.  An event of imagination.

C. A research on space.                    

D. A scientific adventure.

2. When the first piece hits the South Atlantic,it causes_________.

A. an earthquake                            

B. damages to cities

C. an Earth explosion                        

D. huge waves

3.  Why can't the northern half of the earth escape for long?    

A.  Because the land is covered with water.

B.  Because the light and heat from the sun can not reach the earth.

C.  Because people there can not live at the temperature of zero.

D. Because wars break out among countries.

4. By giving the example of dinosaurs,the author tries to prove_____.

A. animals could not live in the cold climate

B. what happened 65 million years ago was an invented story

C.  the human beings will die out in 2094

D. the Earth could be hit by other objects in space

多项选择题