下载APP
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【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.
相关题目：
【单选题】三角测量网的布设要求各等级的首级控制网宣布设为近似等边三角形的网，其三角形的内角不应( )。
A.
小于50。
B.
小于45。
C.
小于30。
D.
小于2。
【判断题】只有POS辅助空中三角测量才能够实现真正意义上的全自动空中三角测量。
A.
正确
B.
错误
【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.