冬天架电线时不能把线拉得太紧这是因为导线具有热胀冷缩热胀冷缩的性质．正是由于这样的性质炎热的夏季里用皮尺测铜导线的长度测量的结果比在 Sketch Coloring Page

冬天架电线时不能把线拉得太紧这是因为导线具有热胀冷缩热胀冷缩的性质．正是由于这样的性质炎热的夏季里用皮尺测铜导线的长度测量的结果比在 Template

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tomski冬天架电线时不能把线拉得太紧这是因为导线具有热胀冷缩热胀冷缩的性质．正是由于这样的性质炎热的夏季里用皮尺测铜导线的长度测量的结果比在 coloring

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