true specific gravity
真比重 true density ; Real specific gravity ; true specific weight ; [物] true specific gravity
木材真比重 [木] specific gravity of wood substance
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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.
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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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