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【单选题】
在无线通信中不能采用CSMA/CD方式,这是因为无线通信存在(59),采用CSMA/CA技术是指(60),MAC层的分布式协调功能提供(61),站点发出的确认帧ACK,要在(62)间隔发送。为解决隐蔽站带来的问题,802.11允许(63)。
A.
隐蔽站和暴露站问题
B.
隐蔽站问题
C.
干扰问题
D.
暴露站问题
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举一反三
【单选题】Rukhsar Khatun was mentioned to______.
A.
depict the life of poor people in India
B.
describe the life of handicapped children
C.
introduce the topic of anti-polio campaign
D.
show the development of medical treatment
【简答题】神经组织由 和 构成。
【简答题】神经组织由 和 细胞构成。
【单选题】What famous play was mentioned in the article?
A.
death of a Salesman
B.
Antoby and Cleopartra
C.
Romeo and Juliet
D.
Joan of Arc
【单选题】' Blockbuster' was mentioned in the first paragraph to______.
A.
introduce the topic of the text
B.
introduce the powerful weapon
C.
show linguistic differences of modern words
D.
show various meanings of some English words
【简答题】神经组织由 和 构成。前者又称 ,是神经系统的 ,具有 和 的功能 ; 后者则具有 和 等作用。
【简答题】神经组织由 和 细胞组成 , 二者均包括 和 两部分。
【单选题】Which chinese player was mentioned in the dialogue?
A.
Ma Long
B.
Liu Xiang
C.
Guo Jingjing
D.
Lin Dan
【单选题】He looked distinctly when the subject was mentioned.
A.
comfortable
B.
uncomfortable
【单选题】The Van Gogh's letter(Para. 2) was mentioned to
A.
afford evidence of the origin of Expressionism.
B.
solve the mystery of Van Gogh's drawings.
C.
show the difference between Van Gogh and a cartoonist.
D.
exhibit the unique feature of the Expressionists' art.
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