The foam metal nickel has the advantage of good heat conductivity and the molten salt has the advantage of large heat storage quantity per unit weight or volume.
泡沫金属镍具有传热性能好，熔融盐具有蓄热量大、化学稳定性好等优点。
The bone mineral density (BMD) means the bony mineral quantity per unit area, which is an important index reflecting the metabolic status of the skeleton of human being.
骨密度是指骨单位面积所含的骨矿物量，它是反映人体骨骼代谢状况的一项重要指标。
The theory considers aggregates of quantity demanded by buyers and quantity supplied by sellers at each possible price per unit.
该理论考虑，在每一个可能的单位价格上，买方总的需求量和买方总的供应量。
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