下面是关于计算机定点数和浮点数的叙述，其中正确的是______。A．浮点数的绝对值都

阅读理解。

    Beethoven, a famous musician in the world, was born in Germany in 1770. In his childhood Beethoven

didn't have a happy life. His father was a singer. When he was only four, his father began to make him

practise hour after hour on different musical instruments. If he did not put his heart into it, his father would

beat him or make it hard on him.

    Beethoven loved music and he learned so fast that he was able to go around to give concerts, when he

was only a boy of eleven. At the age of seventeen, he won high praise from Mozart, the great musician at

that time.

    Beethoven was often poor and ill during his life. After one illness, he suddenly found himself deaf (聋).

At that time he was only thirty-one. It was a blow (打击) to him indeed.

    But he still went on working and writing music pieces. To people's surprise, some of his best pieces

were written after he lost his hearing.

    In 1827, leaving more than 300 pieces, the great musician died. But his name is still remembered to this

day.

1. Beethoven was a _____ musician. [ ]

A. America

B. French

C. German

D. British

2. What happened when he was thirty-one? [ ]

A. He was blind

B. He was deaf

C. He gave concerts

D. He won high praise

3. Why didn't Beethoven have a happy life in his childhood?[ ]

A. Because his family was poor

B. Because he had to practise a lot of musical instruments

C. Because his father was strict with him

D. Both B and C

4. The great musician lived in the world for only _____ years. [ ]

A. 43

B. 70

C. 57

D. 60

5. When were some of his best pieces written?[ ]

A. At the age of 11

B. At the age of 17

C. Before he was deaf

D. After he became deaf

当产品氢气纯度降低时，为了提高产品氢纯度可以（）。

A、降低PSA压力

B、减小吸附时间

C、增大吸附时间

D、增大PSA进料量

王师傅和李师傅6天一共安装了72台空调．平均每人每天安装多少台？

良性积液的特点有（）

A.胆固醇增高

B.FDP不高

C.溶菌酶增高

D.CEA增高

E.血性多见

转移财产权利合同规定的出卖人的主要义务不包括( )。

A．标的物质量应符合约定

B．保证第三人向买受人主张权利

C．将标的物的所有权转移给买受人

D．交付标的物和有关单证、资料