secondary control短语¹¹⁴⁴⁶⁷⁺⁴ 基本例句 辅助操纵,次级控制,二等控制 The paper brief introduced the feasibility, handle operate steps and notice of RTK technique used in the survey of secondary control and detail survey, and detailed analyzed the precise of this way. 主要介绍了 RTK技术在地形图图根测量、碎部测量中的可行性和操作步骤及注意事项；并详细分析了该方法的测量精度。 dictall