以长平高速公路试验数据为依据，提出了寒冷地区高速公路沥青表层的容许空隙率的界限。
According to the test data of Changping road, it offers the limitation about porosity of the asphalt surface course on expressway in frigid areas.
景区面积达480平方公里，由四姑娘山、巴郎山、长平沟、海子沟、双桥沟几部分组成。
The scenic area consists of Four Girls Mountain, Balang Mountain, Changping Trench, Haizi Trench and Twinbridge Trench, with coverage of 480 square kilometers.
我国目前主要仍采用长平晶组分段互检方法作为直线度检定基准，测量精度不高(特别是在测量大尺寸零件时尤为明显)。
At present, long optical flat is still mainly adopted as calibrating benchmark in straightness measurement, whose accuracy is not so high (especially in measuring great-size parts).
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