问题：
[多选题]GPS控制测量要求多台接收机同步观测,这样设计的主要目的是为了消除或减弱()。
A、星历误差
B、电离层对流层传播误差
C、多路径效应
D、接收机钟差
E、测站沉降
参考答案：
ABC
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