右图是a、b两种固体物质的溶解度曲线,由该图不能得出的结论是( ) A.b的溶

题型:选择题

问题:

右图是a、b两种固体物质的溶解度曲线,由该图不能得出的结论是(  )

A.b的溶解度都随着温度升高而增大

B.在t℃时,a、b的饱和溶液中溶质的质量分数相同

C.a的溶解度大于b的溶解度

D.b都属于易溶物质

考点:固体溶解度关于溶液的计算物质的溶解性与溶解度的关系
题型:选择题

阅读下面短文,短文后各有五个理解性的题目,在各题所给的A、B、C、D四个选项中,选出一个最佳选项.

    During his life Dr James Naismith worked as a doctor, taught P.E and wrote several books. While he

never thought it very important, Dr Naismith is today best known for one thing. He was the inventor of

basketball.

    Dr James Naismith was born in Canada in 1861 and his first job was at a special sports school in the

USA. One day the school principal told James he was having a problem with the students. Because of

heavy snow, the students could not go outside. He told James that they needed a sport the boys could

play indoors and gave the teacher two weeks to think of something.

    It was on the very last day that James came up with his idea. The "birth of basketball" is said to be on

December 21, 1891, when two teams from the school played the first game. It was quite different from

the basketball  games of  today. It  had 9  players on  each  team and  footballs were used  instead  of

basketballs. Soon after, the game changed to 5 players on each side, using special "basketballs" through

nets.

    Although Dr Naismith did not live to see basketball become the worldwide game it is today, in 1936,

just three years before his death, basketball became an Olympic sport at the games in Berlin.

1. Which of the following things did Dr James Naismith NOT do?

A. Teach P.E in school.

B. Write some books.

C. Work at hospital.

D. Take part in the Olympic Games.

2. In which season did Dr Naismith invent basketball?

A. Summer.

B. Winter.

C. Spring.

D. Autumn.

3. Why is December 21 thought to be the birthday of basketball?

A. It was on this day that Dr Naismith came up with his idea for basketball.

B. It was the day on which Dr Naismith was born.

C. It was the day on which Dr Naismith was asked by his boss to invent a new game.

D. It was on this day that the first game of basketball was played.

4. At the time of Dr Naismith's death, which of the following was true?

A. Basketball was already a worldwide game.

B. Basketball was played with 9 players on each side.

C. Basketball was an Olympic sport.

D. Basketball was still played using footballs.

5. What would be the best title for this story?

A. History of Basketball

B. How Basketball Has Changed

C. Father of Basketball

D. Happy Birthday, Basketball

题型:选择题

一个4Ω的电阻与一个用电器串联在6V电源的两端,现只知道用电器的实际功率为2W,求通过用电器的电流可能是多大?

题型:选择题

我国少数民族约占全国人口总数的 [ ]

A、92%

B、90%

C、12%

D、8%

题型:选择题

下面有关继续注册的时间描述正确的是()。

A.注册咨询工程师注册有效期为2年

B.注册咨询工程师注册有效期为3年

C.申请人需在注册期满前3个月向任职单位提出申请

D.申请人需在注册期满前6个月向任职单位提出申请

E.连续脱离工程咨询岗位超过2年者可取消继续注册

题型:选择题

X、Y、Z为短周期元素,原子序数依次增大.X的最外层电子数是Y原子最外层电子数的2倍,质子数比Y少5,X和Z在同一主族.下列叙述不正确的是(  )

A.原子半径:Y>Z

B.X元素的一种单质可用于消毒杀菌

C.Y的氧化物是工业制取Y单质的主要原料

D.Z的单质在氧气中点燃可生成两种酸性氧化物

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