ADSL技术具有以下哪些特点()。A、电话线上不但能传输语音信号,还能传输高速的数据

题型:多项选择题

问题:

ADSL技术具有以下哪些特点()。

A、电话线上不但能传输语音信号,还能传输高速的数据信号,二者互不影响,从而提高了线路的利用率。

B、可以利用现有铜缆资源,建设周期短,组网方便,建网成本低。

C、下载速度快,ADSL2+下行速率可达24Mbit/s。

D、ADSL的速率与线路长度无关。

考点:数据通信机务员数据通信机务员题库
题型:多项选择题

一部科幻电影中出现这样情景:太空中,一艘飞船向另一艘飞船发射导弹,被导弹击中的飞船响起巨大的爆炸声,接着看到爆炸产生的火…请你指出这个情景其中的一个科学性错误并说明原因.

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As   小题1: she nor her husband smoked, Mrs. Trench was surprised to see cigarette ash on her doorstep as she entered the house. When she opened the living-room door, she was astonished to see a strange man fast   小题2: in an armchair! Taking care not to disturb him, Mrs. Trench left the house immediately. She called a taxi and went straight to the police station. When she got there, she lost no time to explain   小题3:  had happened and added that the man   小题4:  have got into the house   小题5:  an open window. Mrs. Trench returned home   小题6:  a police car together with two policemen. But it was too late: the man had disappeared. 小题7:  (hurry) upstairs, she went to her dressing-table. She smiled   小题8: relief when she saw that the only thing the man had taken was an imitation diamond necklace   小题9:  was almost   小题10: .

题型:多项选择题

能发生原发性肾损伤的传染病有()

A.甲型肝炎

B.乙型肝炎

C.流行性出血热

D.霍乱

E.钩端螺旋体病

题型:多项选择题

下列哪项是全口修复中,上颌中切牙唇舌向倾斜排列的精确位置

A.垂直或切缘略微向唇侧倾斜

B.颈部稍向膊侧

C.颈部向唇侧突出

D.垂直或切缘略微向腭侧倾斜

E.以上都不是

题型:多项选择题

It is unsafe for you to stay here.Please leave this place _____.

A.at all

B.once again

C.right away

D.for a while

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