A. 在视准线两端各自向外的延长线上，宜埋设检核点
B. 在视准线两端，宜埋设检核点
C. 采用小角法进行视准线测量时，观测点偏离视准线的偏角不应超过30＂
D. 采用小角法进行视准线测量时，观测点偏离视准线的偏角不应超过40＂
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