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【多选题】

解析空中三角测量通常采用的平差模型可分为()。

A.
航带法
B.
光束法
C.
后方交会法
D.
独立模型法
参考答案:
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.