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【单选题】
（ ）可在图层上创建锐边形状，它是由自定义形状和钢笔工具创建的蒙版。A.
图层蒙版
B.
矢量蒙版
C.
剪贴蒙版
D.
快速蒙版
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】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.
【简答题】2008年，G淀粉公司雇用临时工将一仓库改建为第三生产车间。该车间为长80m、宽50m、高15m的桁架型砖混结构建筑，分成包装间和产品暂存间，包装间用8m高砖墙与暂存间分隔。第三生产车间拥有8台打包机、6台振动筛。振动筛安装在6m高的二层钢制平台上，振动筛内的筛子采用木质框架，筛子四角与振动筛用铁质螺栓连接，振动筛开关和电机为防爆电器设备。 2010年3月2日10时25分，"-3班班长甲发现5号振...
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