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【多选题】

​以下是解析空中三角测量优势的是( )

A.
不受通视条件限制
B.
可快速地在大范围内同时进行点位测定
C.
不触及被量测目标即可测定其位置和几何形状
D.
区域内部精度均匀,且不受区域大小限制
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参考解析:
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【单选题】It is now almost two years since the European Union decided to go ahead with plans to launch a satellite-navigation network to rival America’s existing Global Positioning System (GPS). For much of thi...

A.
Using of various signals for communication.
B.
Writing message or information in secret code.
C.
Automatic ally operated positioning system.
D.
Accuracy checking device.