同时给出了各能耗指标间的数学关系及节能难度指数。
The mathematic relation of indexes of energy consumption and the difficult index of saving energy were presented simultaneity.
以外力地质作用、困难度指数和地表切割密度作为公路地貌二级区划的主导指标；
Based on those works, the index system of landform regionalization of highway in China was developed.
如果 lgA 指数突然下降到某一水平以下，训练就会降低难度或完全取消。
If lgA levels suddenly fall below a certain level, training is eased or dropped altogether.
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