Application of Shortwall Electric Haulage Shearer Loaders MG250/ 300 NWD
短臂电牵引MG250/300-NWD型采煤机的应用
The average, the standard deviation and the coefficient of variation of the sample attributes of the NWD are the reflections of the basic quantitative characteristics of the nested habitats.
由近湿地类型区样点属性计算平均值、标准差和变异系数,获得了朱鹮营巢生境的数量特征;
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