主单元 meaning in Chinese

main unit
master unit

One master unit circular check the status of one or several slave unit
一个主单元轮流去询问各个从属单元的状态。
In order to scientisfic classification , according to four diffierent standards , the classifications of thematic maps form were put forword . visual effect scheme including line form , image form and three - dimensional form . map layout scheme including main unit form and multi - unit form . scheme of generalization degree of contents , it contains analytical form and integrated form including compound form and synthetic form . scheme of conetnet framework and means of representation
为科学分类，依据4种不同标志，提出了专题地图4种分类方案：视觉感受方案：线划图型、影像图型和立体图型；图面结构方案：主单元和多单元图型；内容概括程度方案：综合与分析图型，其中综合图型又分组合型与合成型；内容结你与表示方法方案：等量线图型、向量线图型、统计图型、分布图图型、类型图图型和区划图图型。