【单选题】【消耗次数：1】
无线局域网的技术标准，( )的数据传输速率可达300Mb/s以上，理论传输速率最高可达600Mb/s。
①
IEEE802.11a标准
②
IEEE802.11n标准
③
IEEE802.11g标准
④
IEEE802.11b标准
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【简答题】
802.11标准规定无线局域网的最小构件是BSS，其中文名称是[填空]
【单选题】
以下关于802.11无线局域网基本概念的描述中，错误的是（）。
①
802.11的物理层定义了红外、跳频扩频与直接序列扩频的数据传输标准
②
802.22的MAC层支持多个接入点的漫游，同时提供数据验证与保密服务
③
802.11的MAC层采用CSMA/CA算法
④
802.11的网络层支持按需的路由选择协议
【单选题】
以下关于无线个人区域网与IEEE 802.15.4标准的描述中，错误的是（ C ）
①
IEEE批准低速无线个人区域网LR-WPAN标准——802.15.4
②
802.15.4标准将网络拓扑分为两种类型:星型与点-点拓扑结构
③
星型结构中所有设备都与中心设备——IP路由器通信
④
点-点网络应用于工业检测与控制.货物库存跟踪和智能农业
随机题目
【单选题】
6.And there, almost____in the big chair, sat her little brother, who never had to be told to keep quiet.
①
having lost
②
losing
③
to be lost
④
lost
【单选题】
17.____, the subject was always in my mind.
①
Walking or sleeping
②
Walking or slept
③
Having walked or slept
④
To walk and sleep
【单选题】
20. The joke told by Tom made us_____, so our maths teacher couldn’t make himself _____.
①
to laugh; hearing
②
laughing, heard
③
laughing; hear
④
laughed; heard
【单选题】
15.The program was so exciting that the children kept their eyes ____on the screen.
①
to fix
②
to be fixed
③
fixed
④
fixing
【单选题】
10.In January, 2004, the United States successfully launched “spirit”, a Mars Exploration Rover, _____ a new milestone in the history of mankind.
①
it marked
②
marking
③
marked
④
to mark
【单选题】
19. When he came to, he found himself _____ on a chair, with his hands _____ back.
①
to sit; tying
②
sitting; tying
③
seating; tied
④
seated; tied
【单选题】
13.The monument(里程碑) was built in honor of the explorer who was believed ____the river.
①
to have discovered
②
to have been discovered
③
to discover
④
having been discovered
【单选题】
2. — Have you considered _____ your job as a teacher? —Yes. I like the job because a teacher is often considered _____ a gardener.
①
to change; to be
②
to change; being
③
changing; being
④
changing; to be
【单选题】
8.To answer correctly is more important than____.
①
that you finish quickly
②
finishing quickly
③
to finish quickly
④
finish quickly
【单选题】
3. The dog, ____, will be made a good watchdog.
①
to train properly
②
being trained properly
③
properly to train
④
trained properly