题目:
底卸式矿车水平弯道半径不小于6m。
答案:
参考答案:错
底卸式矿车水平弯道半径不小于6m。
参考答案:错
There have been many great inventions or things that changed the way we live. The first great invention was the one that is still very important today——the wheel. This made it easier to carry heavy things and to travel long distance.
For hundreds of years after that there were few inventions that as much effect as the wheel . Then in the early 1800s the world started to change. There was little unknown land left in the world. People didn’t have to explore much any more. They began to work instead to make life better.
In the second half of the 19th century many great inventions were made. Among them were the camera, the light and the radio. These all play a big part in our daily life today.
The first part of the 20th century saw more great inventions. The helicopter in 1909, movies with sound in 1926, the computer in 1928, jet planes in 1930. This was also a time when a new material was first made. Nylon came out in 1935. It changed the kind of clothes people wore.
The middle part of the 20th century brought new ways to help people get over diseases. They worked very well. They made people healthier and allowed them to live longer. By the 1960s most people could expect to live to be at least 60.
By this time most people in developed countries had a very good life. Of course new inventions continued to be made. But man now had a desire(渴望) to explore again. The earth was known to man but the stars were not. Man began looking for ways to go into space. Russia made the first step. Then United States took a step. Since then other countries , including China and Japan, have made their own steps into space.
In 1969 man took his biggest step away from earth. Americans first walked on the moon. This is certainly just a beginning, though. New inventions will some day allow us to do things we have never yet dreamed of.
小题1: This passage talks mainly about .
A.why cars were very important
B.when light was invented
C.how inventions affect people’s daily life
D.which country made the first step into space小题2:According to the passage man didn’t have a desire to explore a lot .
A.at the beginning of 1800s
B.in the 1960s
C.since the 1900s
D.from the 1800s to 1960s小题3:In the 1800s, people began to work in order to make
A.explorations
B.their life better
C.discoveries
D.a trip to space小题4: Nylon came out of five years later than .
A.radio
B.camera
C.jet planes
D.movies小题5:People can live longer lives because that help cure diseases have worked very well.
A.doctors
B.new ways
C.medicines
D.new hospitals
已知一动圆M,恒过点F(1,0),且总与直线l:x=﹣1相切.
(1)求动圆圆心M的轨迹C的方程;
(2)探究在曲线C上,是否存在异于原点的A(x1,y1),B(x2,y2)两点,当y1y2=﹣16时,直线AB恒过定点?若存在,求出定点坐标;若不存在,说明理由.
五叶芦根汤用于下列何证()
A.湿温后期,余湿未尽证
B.风温后期,肺胃阴伤证
C.春温后期,邪留阴分证
D.暑湿后期,肺胃气液两虚证
E.湿温后期,湿胜阳微证
企业法人分立、合并,它的权利和义务由( )享有和承担。
A.原企业法人
B.变更后的企业法人
C.无法人
D.合同规定由谁
米索前列醇的抗消化性溃疡作用
A.与抑制幽门螺杆菌有关
B.与抑制免疫过程的许多环节有关
C.与促进黏液和HCO3ˉ分泌,增强黏膜屏障有关
D.与阻断胃壁细胞H2受体有关
E.与增加抗体形成有关