two-ringCOCA²⁰⁶³⁴⁸BNC¹⁷³⁹⁹⁵⁺² 基本例句 🌏轮子两个 The distribution law of pressure potential in saturated soil using two-ring infiltration method to determine the permeability coefficient was different to that using cutting ring method. 当采用双环入渗法和环刀法测定土壤的饱和渗透系数时,土壤剖面土壤水压力势分布规律不同。 tcsae