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【单选题】
以下对VLAN的描述是正确的是()。A.
VLANID标识字段的范围是1～4096
B.
VLAN仅包括VLAN标识字段和用户优先级别字段
C.
在支持VLAN的局域网中，二层组播可以限制在VLAN的范围内
D.
如果以太网帧中2个字节的Type域值为0x8100，那么这个帧就是VLAN帧
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【单选题】听力原文： New England is an area of mountains, valleys, and rivers. It is said that in New England one is always climbing hills. A large pm of New England is also made up of farms and farming lands. Yet N...
A.
It is completely flat.
B.
It has few rivers.
C.
It has many large lakes.
D.
It is hilly.
【单选题】刊名The New England Journal of Medicine的国际标准(ISO)缩写为( )。(参见章节2.5.4)
A.
N Engl J Med
B.
New Eng J Med
C.
N. Engl. J. Med.
D.
New. Eng. J. Med.
【单选题】Why farming is much more difficult in New England than in some other parts?
A.
Because New England is very cold.
B.
Because New England has many trees.
C.
Because New England has thin, rocky soil.
D.
Both B and C
【单选题】刊名The New England Journal of Medicine的国际标准(ISO)缩写为( )。
A.
N Engl J Med
B.
New Eng J Med
C.
N. Engl. J. Med.
D.
New. Eng. J. Med.
【单选题】单片机C51程序中有延时子函数: void delay(unsigned int z) { unsigned int i,j; for(i=z;i>0;i--) for(j=123;j>0;j--); } 则在按键检测中,延时去抖的时间合理的是 ________ 。
A.
delay(1);
B.
delay(10);
C.
delay(100);
D.
delay(1000);
【单选题】______ does not belong to New England.
A.
Maine
B.
Vermont
C.
New York
D.
Rhode Island
【单选题】The chief spokesman of New England Transcendentalism is __________
A.
Nathaniel Hawthorne
B.
Ralph Waldo Emerson
C.
Henry David Thoreau
D.
Washington Irving
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