ray ratio

Blu-ray discs outsold HD-DVDs by a ratio of two to one before Christmas and by the end of last year there were 4m Blu-ray-capable players in North America, compared with about 750,000 HD-DVD machines.

圣诞节前，蓝光影碟的销售量是HD-DVD的两倍。到去年年底，北美有400万台支持蓝光格式的影碟机，而HD-DVD影碟机仅为75万台左右。

Meanwhile, the radial width of cambial fusiform cell had negative correlations with fiber length, ratio of fiber length to width and ratio of ray tissue, and a positive correlation existed between tangential width of cambial fusiform cell and fiber width.

形成层纺锤形细胞的径向宽度与纤维长度、纤维长宽比和射线比量呈显著负相关；形成层纺锤形细胞的弦向宽度与纤维宽度呈显著正相关。

No significant differences in tangential and radial width of cambial fusiform cell, length of vessel element, ratio of fiber and ray tissue were found among different stages.

结果表明，形成层纺锤形细胞的径向和弦向宽度在活动期不同阶段差异不显著，而纤维长度、纤维宽度、壁腔比、微纤丝角、导管分布频率和胞壁率差异极显著；

Indicators contain UV ray transmittance screening ratio, protective factor, penetration and reflectance.

其评价指标则有紫外线透射比、遮挡率 、 防护因数 、 穿透率和反射率等.

X-ray Measurement on Lunate Uncovered Length and Uncovering Ratio of Normal Adult Wrist Joint

成人正常腕部月骨暴露长度及暴露率的X线测量