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【单选题】
在一个地方,一般形成风俗的事件都是比较A.
小的
B.
不大不小
C.
大的
D.
无所谓
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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.
【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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