That just means our mass unit becomes the area unit.
那只意味着质量单位变成了面积单位。
The density for a flat object would be the mass per unit area.
一个平面物体的密度是每单位面积元的质量。
because it's a unit disk. And, the center of mass is the center of a disk.
因为它是一个单位圆盘，这部分的中心就是圆盘的中心。
What we're going to get then is mass per unit area.
所以我们的到的是单位面积上的质量。
Cattle produced the least carbon dioxide per unit of body mass.
每单位体重，牛产生的二氧化碳最少。
So these two together, l times rho, give us mass per unit area.
这两个量，l乘以ρ,一起给出单位面积上的质量。
A unit of measurement for mass.
用于测量质量的单位。
Mass per unit of volume in powder form, including the air trapped between the particles.
每单位体积粉末的质量，包括粒子之间的空气。
In physics it is an identification of material by noting its mass per unit volume.
在物理学上，是以每单位体积的质量来鉴别物质。
The decrease in unit manufacturing cost that is due to mass production.
由于大规模生产，所以单位成本降低了。
The plate unit could better simulate the occurrence of rock mass;
使用板状结构单元可以很好地模拟岩体产状；
ASTM D5848 Standard Test Method for Mass Per Unit Area of Pile Yarn Floor Coverings.
ASTMD5848簇绒纱线地毯单位面积质量的试验方法。
ASTM D5848 Standard Test Method for Mass Per Unit Area of Pile Yarn Floor Coverings.
ASTMD5848簇绒纱线地毯单位面积质量的试验方法。
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