皮皮学，免费搜题
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搜题
【单选题】
蛛网膜下腔出血的患者,应绝对卧床休息A.
12小时
B.
24小时
C.
3-5天
D.
2-3
E.
4-6
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】What is Omni-directional antenna?
A.
An antenna which is capable of line-of-sight communication with a satellite without requiring any pointing
B.
Generally it is used on an INMARSAT-M MES
C.
Generally it is used on an INMARSAT-F MES
D.
This is a kind of directional antenna
【单选题】What might be the obstacles for transmitting antenna and receiver antenna to get connected?
A.
Deep oceans
B.
High mountains.
C.
Long rivers.
D.
Huts.
【单选题】在一个URL:"http://www.pku.edu.cn/index.html"中的"www.pku.edu.cn"是指______。
A.
一个主机的域名
B.
一个主机的IP地址
C.
一个Web主页
D.
一个MAC地址
【简答题】天线色素(antenna pigment)
【单选题】Antenna gain is obtained by...? （）
A.
A power amplifier in the antenna system
B.
Concentration of radiation
C.
Highly effective antenna cables
D.
Good SWR (Standing Wave Ratio)
E.
A spherical radiation pattern
【单选题】What is omni-directional antenna?
A.
An antenna which is capable of line-of-sight communication with a satellite without requiring any pointing.
B.
Generally it is used on an Inmarsat-B MES.
C.
Generally it is used on an Inmarsat-F MES.
D.
This is a kind of directional antenna.
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