The content of n, P, K, Ca and Mg in root decreased as root diameter increased.

根中氮、磷、钾、钙、镁含量随根径的增大而减少。

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The surface area and micro-pore volume decreased as the oxidation degree becoming more serious, while the average pore diameter increased.

随着氧化程度的加深，活性炭的比表面积、微孔体积都减小，平均孔径增加。

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The enlargement of hole diameter increased the exposed area and pressure releasing range of bored coal seam, and raised gas drainage amount and discharging effect from holes.

通过扩大钻孔的直径，从而达到增加钻孔的煤层暴露面积和卸压范围，增大钻孔抽排瓦斯量，提高钻孔的抽排效果。

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Also adding to the nostalgia of using an old-fashioned number two is the larger rubber tip, slightly bigger diameter (8mm) and increased length of the pen itself.

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