方法：使用电热干燥箱作热源，用密度计测量胶片上各级灰阶的密度。
Methods: to employ an electrothermal drier as a heat source and measure density of grey scale in film with a densitometer.
用X射线扫描密度计测量气干材含水率及其每一年轮的水分分布。
In this paper, the moisture content and its distribution of each growth ring in air dried wood specimens have been tested by using X-ray scanning densitometer.
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