利用激光单缝衍射技术测量大气飘尘的真比重，具有精度高和测试方法简便易行的特点。
The method to determine the real specific gravity of atmospheric dust by using laser slitdiffraction technology has high precision and is easy to handle.
样品的真密度和比重都能够显示出来。
True density and specific gravity of your sample are displayed.
样品的真密度和比重都能够显示出来。
True density and specific gravity of your sample are displayed.
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