搜题请搜索小程序“爱下问搜题”
问题 单项选择题

一台主机的IP地址为202.113.224.68，子网屏蔽码为255.255.255.240，那么这台主机的主机号为________。

A．4

B．6

C．8

D．68

答案

参考答案：A

解析：[知识点] Internet通信协议——TCP/IP
[评析] 将IP地址与子网屏蔽码转换为二进制形式，然后两者进行AND操作，即可得出IP地址为202.113.224.68的主机所在的网络，为202.113.224.64，所以这台主机号为68-64=4。

单项选择题

There has been much speculation about the origin of baseball. In 1907 a special commission decided that the modern game was invented by Abner Doubleday in 1839. One hundred years later the National Baseball Museum was opened to honor Doubleday. Historians, however, disagree about the origin of baseball. Some say that baseball comes from bat-and-ball games of ancient times. It is a matter of record that in the 1700s English boys played a game they called "baseball". Americans have played a kind of baseball since about 1800. At first the American game had different rules and different names in various parts of the country — "town ball", "rounders", or "one old cat". Youngsters today still play some of these simplified forms of the game.Baseball did not receive a standard set of rules until 1845, when Alexander Cartwright organized the Knickerbocker Baseball Club of New York City. The rules Cartwright set up for his nine-player team were widely adopted by other clubs and formed the basis of modern baseball. The game was played on a "diamond" infield with the bases 90 feet apart. The first team to score 21 runs was declared the winner. By 1858 the National Association of Baseball Players was formed with 25 amateur teams. The Cincinnati Red Stockings began to pay players in 1869.

Which of the following is true about the origins of baseball

A．Historians agree that baseball was invented by Abner Doubleday.

B．Baseball, as played in the early 19th century, differed very little from today’s game.

C．As early as the 1700s, English boys played a game called "baseball".

D．The first standard set of baseball rules was established at the turn of the century.
查看答案
单项选择题 A1型题

生长发育最重要的物质基础是（）。

A.遗传

B.体育锻炼

C.营养

D.水分

E.生活作息制度
查看答案