论述了地图符号的说明注记和数字注记的集合及属性，并分别给出了这两种注记的识别方法。
Sets and properties of explanation and numeral notes of map symbols are discussed. The recognition methods of two notes are given too.
论述了地图符号的说明注记和数字注记的集合及属性，并分别给出了这两种注记的识别方法。
Sets and properties of explanation and numeral notes of map symbols are discussed. The recognition methods of two notes are given too.
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