Free convection has been defined as a flow driven by density variations.
自由对流是一种由于流体的密度变化而产生的流体的运动。
Primary researches on the groove density variations of bending grating were experimented.
对压弯光栅的线密度进行了实验研究。
The density variations of deformed powder metallurgical molybdenum bars were tested by using suspending weight method.
通过悬重法测量热变形后粉末冶金钼坯致密度的变化情况。
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