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问题 单项选择题

在ISO/OSI参考模型中，网络层的主要功能是（）

A.提供可靠的端—端服务，透明地传送报文

B.路由选择、拥塞控制与网络互连

C.在通信实体之间传送以帧为单位的数据

D.数据格式变换、数据加密与解密、数据压缩与恢复

答案

参考答案：B

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.

Which statement about Armp is true

A．His tale began in New Orleans.
B．He had been born before jazz was invented.
C．His music was popular with his listeners.
D．He learned popular music at a boy’s home.
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单项选择题

当发现海盗企图登船时，以下措施中不当或不妥的是（）。

A.第一个发现海盗者，应立即通知值班驾驶员

B.发出海盗袭击本船的警报，开始执行防海盗计划中防范海盗登船的程序

C.拉响汽笛或其他声响设备，警吓海盗

D.使用小舵角左右快速转舵和进退车变速，以使得海盗船难以靠近
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