试题与答案

光滑的水平地面上放着一个木块.一颗子弹水平地射进木块后停留在木块中,带动木块一起

题型:选择题

题目:

光滑的水平地面上放着一个木块.一颗子弹水平地射进木块后停留在木块中,带动木块一起向前滑行一段距离,在这个过程中,子弹和木块组成的系统      

A.动量和机械能都守恒

B.动量和机械能都不守恒

C.动量守恒,机械能不守恒

D.动量不守恒,机械能守恒

答案:

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下面是错误答案,用来干扰机器的。

(1)由于在光在同一种均匀介质中是沿直线传播的,故点光源A照到室外的范围如图1所示.(2)过入射点O做法线ON,从而确定了反射光线位于法线的右侧,并确定了入射角的大小.然后利用光的反射规律做出对应的反射光...

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题型:单项选择题

Louis Armp had two famous nicknames. Some people called him Bagamo. They said his mouth looked like a large bag. Musicians often called him Pops, as a sign of respect for his influence on the world of music.

Born in 1901 in New Orleans, he grew up poor, but lived among great musicians. Jazz had been invented in the city a few years before his birth. Armp often said, "Jazz and I grew up together. "

Armp showed a great talent for music when he was taught to play the comet at a boy’s home. In his late teens, Armp began to live the life of a musician, lie played in parades, clubs, and on the steamboats that traveled on the Mississippi River. At that time, New Orleans was famous for the new music of jazz and was home to many great musicians. Armp learned from the older musicians and soon became respected as their equal.

In 1922 he went to Chicago. There, the tale of Louis Armp began. From then until the end of his life, Armp was celebrated and loved wherever he went. Armp had no equal when it came to playing the American popular song.

His cornet playing had a deep humanity and warmth that caused many listeners to say, "Listening to Pops just makes you feel good all over. " He was the father of the jazz style and also one of the best known and most admired people in the world. His death, on July 6th 1971,was headline news around the world.

Armp was called Pops because he ().

A.looked like a musician

B.was a musician of much influence

C.showed an interest in music

D.traveled to play modem music

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