ping命令发送以下______个报文。A) 4 B) 10 C) 32 D) 64_爱下问搜题

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问题单项选择题

ping命令发送以下______个报文。

A) 4
B) 10
C) 32
D) 64

答案

参考答案：A

解析： ping命令的功能是通过发送ICMP报文监听回应报文，检查与远程或本地计算机的连接，默认情况下发送4个报文，每个报文包含字节数据。

单项选择题

跨系统银行往来的资金清算必须通过( )办理。

A．当地结算中心

B．银行业监督管理委员会

C．中国人民银行

D．全国银行间债券系统

完形填空

阅读下面短文，掌握其大意。然后从36-55各题所给的选项中，选出最佳选项，并在答题卡上将该项涂黑。
Mark was seven when he joined his father and two other elder brothers at sunrise in the fields. __36__ the time he was eight he was helping Dad fix up old furniture. He was given a cent for every nail he __37__ out of old boards.
He got his first __38__ job at BT’s Restaurant in town, when he reached twelve. His main tasks were__39__tables and washing dishes, __40__sometimes he helped cook.
Every day after school he would __41__ to BT’s and work till ten. Even on Saturdays he __42__ from two till eleven. At that age it was difficult going to work and __43__ his friends run off to swim or play. He didn’t necessarily like work, but he loved what working __44__ him to have. Because of his __45__ he was always the one buying when his friends and he went to the local shop. That made him __46__.
Word that he was trustworthy and hard-working __47__ around the town. A local clothing shop offered him credit（赊帐）__48__ he was only in Grade 7. He immediately __49__ a $ 68 sports coats and a $ 22 pair of shoes. He was__50__ only 65 cents an hour, and he already owed the shopkeeper $ 90! So he learned __51__ the danger of easy credit. He paid it __52__ as soon as he could.
The first job taught him self-control, responsibility and brought him a __53__of personal satisfaction few of his friends had experienced. As his father, __54__worked three jobs, once told him, “If you__55__sacrifice and responsibility, there are not many things in life you cannot have.” How right he was!

D．participate