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【简答题】
物体的加速度跟所受的合外力成 比,跟物体的质量成 比,加速度的合外力的方向相同。这就是牛顿第二定律。
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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】A parabolic dish antenna is a(n) _________ antenna.
A.
unidirectional
B.
horn
C.
omnidirectional
D.
bidirectional
【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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