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【单选题】
下列关于IEEE802.11标准的描述中，错误的是( )。A.
IEEE802.11无线传输的频道定义在UNII波段（5GHz频段）
B.
IEEE802.11在物理层定义了两个扩频技术和一个红外传播规范
C.
IEEE802.11在MAC子层引入了一个RTS/CTS选项
D.
IEEE802.11定义的传输速率是1Mbps和2Mbps
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【简答题】人们现在已经意识到使用手机也有一些弊端。(aware)
【单选题】We should try our best to prevent air pollution ______ a happier life. [ ]
A.
from living
B.
living
C.
to live
D.
to living
【单选题】Our living standard is still very low, but we are ______ living in poverty.
A.
by all means
B.
by no means
C.
by every means
D.
by means of
【简答题】开立（ ）是投资者进行证券交易的先决条件。
【单选题】From the health point of view we are living in a marvelous age. We are immunized from birth against many of the most dangerous diseases. A large number of once fatal illnesses can now be cured by mode...
A.
traffic accidents are mainly caused by motorists
B.
thousands of people the world over are killed each year
C.
the laws of some countries about driving are too lax
D.
only stricter traffic laws can prevent accidents
【单选题】运行下面程序时，若从键盘输入3,5CR，则程序的输出结果是________. #include stdio.h void main( ) { int x,y; scanf(%d,%d,x,y); if (x==y) printf(x==y); else if (xy) printf(xy); else printf(xy); }
A.
3<5< /div>
B.
5>3
C.
x>y
D.
x
【单选题】From the health point of view we are living in a marvelous age. We are immunized from birth against many of the most dangerous disease. A large number of once fatal illness can now be found for the mo...
A.
traffic accidents are mainly caused by motorists
B.
thousands of people the world over are killed each year
C.
the laws of some countries about driving are too lax
D.
only stricter traffic laws, can prevent accidents
【单选题】下列各句中，语意明确的一句是（ ）。
A.
随着科技的发展，一种新型手机已经问世，它使用了太阳能电池，具有指纹识别功能，能耗较低，有光即可充电。
B.
这一桩发生在普通家庭中的杀人悲剧在亲戚当中也有着不解和议论，要说小莉的妈妈不爱她家里人谁也不相信。
C.
因患病住院，83岁高龄的黄昆和正在美国的姚明没能到场领奖。
D.
我们一方面要加强培养人才的工作，另一方面要把现有的中年知识分子用好，把他们的积极性充分调动起来。
【简答题】展示查找的四种构图形式的主图。(4张图) 2、自主制作三家店铺的主图。(3张图) ps:需要表明你所使用的构图类型
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【单选题】运行下面程序时，若从键盘输入3,5CR，则程序的输出结果是________. #include stdio.h void main( ) { int x,y; scanf(%d,%d,x,y); if (x==y) printf(x==y); else if (xy) printf(xy); else printf(xy); }
A.
3<5< /div>
B.
5>3
C.
x>y
D.
x