由于密度是质量除以体积，相对密度和相对大小给予相对群众。

Since density is mass divided by volume, the relative densities and relative sizes give the relative masses.

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本文通过大量的粉煤灰击实试验和相对密度试验，分析了试验方法对设计密度的影响。

This paper presents testing results on a wide range of fly ash, after analyzing the effects of test methods on the resulted density.

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病例组血管管径减小，血管的体积密度和相对面积比率均较对照组显著降低（P<0.05），而两组的血管数量密度无明显改变（P>0.05）。

Compared the POAG group with control one, the Vv and Ss ofcapillaries in ONH were significantly reduced (P<0.05), The morphometer NA in POAG group was no different with control (P>0.05).

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