在从样本星的色指数（B -V） ，（U -B）和视差得到它们的有效温度和光度之后，我们发现在赫罗图上它们大多数是位于主序带内的。
After deriving their effective temperatures and luminosities from their (B-V), (U-B) colors and parallaxes we find their positions in the HR diagram to be mostly confined to the main sequence.
试验结果表明，在温度水平一定的条件下，砂岩的孔隙度随有效应力的增加而呈负指数规律减小；
The test results show that the porosity of sandstone decrease with the increasing effective stress at the fixed temperature level, following the law of negative exponent.
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