infrared gas density meters 红外线气体浓度感测器 ; 红外滤光器
Oscillation-type density meters 振荡式密度计 ; 振荡型密度计 ; 摆动式密度计
Density meters utilizing ionizing radiation 电离辐射密度计
Moistures & Density Meters 水分计及比重计
Laboratory Oscillation-type liquid density meters 实验室振动式液体密度仪检定规程
The second grade stancard densitometers are the most ideal meters for the job-deternining the density of liquids-in the laboratories of scientific research institute.
对研究室、化验室在测定液体密度时，使用二等标准密度计较为相宜。
The actual density of atoms is equivalent to roughly 1 proton per 4 cubic meters.
原子的实际密度大约只有4立方米中一个质子。
Step4 section: Venus atmospheric density is very high and the pressure equivalent to 3000 meters underwater pressure.
第四段：金星大气层密度非常之高，造成的压力相当于3000米海底压强。
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