[多选题]关于工程测量高程控制的施测方法,下列说法正确的是()

A、采用水准测量
B、四等及以下等级可采用GPS拟合高程测量
C、五等可采用GPS拟合高程测量
D、四等及以下等级可采用电磁波测距三角高程测量

参考答案： A@#@C@#@D

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