R1 and R2 have high lustrous carbon productive ratio. R3 can relax the thermal expand in great extent.
其中R1和R2具有高的光亮碳生成率，R3可减小型砂的热膨胀。
The Capital to Income Ratio – How productive are you at accumulating wealth?
资产的收入比例——怎样才能多产地累积财富？
The significance of ditching ratio per ten thousand ton ores for open pits is given, and how to use this index to test productive capacity of stope is briefly discussed.
对露天矿万吨矿石开沟比的含义，及如何利用这一指标对采场生产能力进行检验，作了简要的论述。
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