The unit area value of double cropping, row cropping was 1.76 and 1.35 times of sole cropping.
复种、间作农田单位面积产值分别为单作一熟农田的1.76和1.35倍。
The formula presented in Tom 3 of "Mining Design Manual" is for approximate calculation, the area value determined from which is some less than that obtained from the formula given here.
在《采矿设计手册》第3卷载的圆弧拱巷道断面积公式是近似计算的，其值比本文推导公式的值稍小。
The formula presented in Tom 3 of "Mining Design Manual" is for approximate calculation, the area value determined from which is some less than that obtained from the formula given here.
在《采矿设计手册》第3卷载的圆弧拱巷道断面积公式是近似计算的，其值比本文推导公式的值稍小。
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