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【简答题】
There are stories about two US presidents, Andrew Jackson and Martin Van Buren, which attempt to explain the American English term OK. We don't know if either story is true,but they are both interesting. The first explanation is based on the fact that President Jackson had very little education. In fact, he had difficulty reading and writing. When important papers came to Jackson,he tried to read them and then had his assistants explain what they said. If he approved of a paper,he would write "all correct,, on it. The problem was that he didn? t know how to spell. So what he really wrote was "ol korektv. After a while,he shortened that term to “OK". The second explanation is based on the place where President Van Buren was born, Kinderhook,New York. Van Buren? s friends organized a club to help him become President. They called the club the Old Kinderhook Club,and anyone who supported Van Buren was called “OK”.
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参考答案:
举一反三
【单选题】如图所示阶梯杆,CD段为铝,横截面积为A;BC和DE段为钢,横截面积均为2A。则1-1,2-2,3-3截面上正应力的大小次序为__________。【图片】
A.
σ 1 > σ 2 > σ 3
B.
σ 2> σ 3> σ 1
C.
σ 3 > σ 1 > σ 2
D.
σ 2 > σ 1> σ 3
【简答题】什么是ARP欺骗或ARP病毒?
【单选题】根据《联合国海洋法公约》及有关规定,一国在沿岸线上或沿岸岛屿上选定若干基点,并将相邻基点用直线连接而成的折线作为其领海基线,则该国在确定其领海宽度时,所采用的是_____。I正常基线 II直线基线 III混合基线
A.
B.
C.
Ⅱ、Ⅲ
D.
Ⅰ、Ⅲ
【简答题】电气图是用国家统一规定的电气( ),按制图规则表示电气设备生产、制作、安装或( )原理、相互连接顺序的图形。电气设备是指发、输、变、配、用设备及其( )、保护测量、监察、指示等设备及连接导线、母线、电缆等,而用电设备则包括( )、照明、弱电等耗用电能的设备。
【单选题】根据《联合国海洋法公约》及有关规定,一国在沿岸线上或沿岸岛屿上选定若干基点,并将相邻基点用直线连接而成的折线作为其领海基线,则该国在确定其领海宽度时,所采用的是( ) 1正常基线 2直线基线 3混合基线
A.
B.
C.
②③
D.
①③
【单选题】下列不属于ARP攻击的类型的是()。
A.
ARP伪造IP地址欺骗client
B.
ARP伪造网关欺骗client
C.
ARP伪造client欺骗网关
D.
ARP Flood攻击
【简答题】简述ARP欺骗的防范方法
【多选题】ARP欺骗是黑客常用的攻击工具之一,ARP欺骗分为以下两种()。
A.
针对路由器ARP表的欺骗
B.
针对交换机ARP表的欺骗
C.
针对个人PC的ARP表欺骗
D.
针对内网PC的网关欺骗
E.
针对外网服务器的欺骗
【多选题】ARP欺骗有哪些危害?
A.
局域网之间主机通信会收到影响,如果是网关欺骗,上互联网也会受影响 ;
B.
黑客利用ARP欺骗可以窃取用户敏感信息、挂马等;
C.
只要不上外网就不会感染ARP;
D.
感染ARP病毒后会出现IP地址冲突。
【简答题】连线规则的作用是 。
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