单词	原始抽样单位
释义	原始抽样单位primary sampling unit
随便看	nitrogen conversion factor nitrogen cushion nitrogen cycle nitrogen deposition nitrogen depth profile nitrogen determination nitrogen dioxide nitrogen dioxide gas nitrogen dioxide gas injury nitrogen dioxide liquid nitrogen dioxide， nitrogen peroxide nitrogen distribution nitrogen efficiency nitrogen enhanced nbti nitrogeneous matter nitrogen equilibrium nitrogen equivalent nitrogen excretion nitrogen family nitrogen fertilizer nitrogen filled lamp nitrogen filled protection nitrogen fixation nitrogen fixation bacteria nitrogen-fixation bacteria