It is frequently referred to as "pressure head" when expressed in terms of energy per unit weight of water . 当以单位水重的能量来表达时,经常看作为“压头”。
Perhaps a key adaptive advantage of the angiosperm is their ability to construct wood with much less expenditure of energy per unit weight . 也许被子植物适应优势的秘诀就在于它们有能力形成每单位重量的木材可支付少得多的能。
Test on supervision and control of dry unit weight of warping dam 淤地坝干容重的监理控制试验
Unit weight approach for model sediment 模型试验的泥沙重度浅析
Study on the relationship between maize unit weight and the water content 玉米容重与水分相关性分析