定义为群折射率(group index),一个常用的 光学参数。 色散介质:在该介质中传输的光波,相速度 与群速度均与波长有关,即材料色散, 这种介 质称作色散介质。
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Target Group Index 目标群体指数 ; 目标用户集中度 ; 群体指数
code group index 代码组索引
group-index 分层指数
group index of refraction 群折射率
group index number 分类指数 ; 分组指数
methylol group index 羟甲基指数
orientating group index 定位基指数
basic group index method 基本分组数法
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In the control group, index fingers were longer in 31% and shorter in 52%. The rest of the men had fingers of equal length.
在对照组,食指长的占到31%,而食指相比无名指短的占到52%,其余的成员食指和无名指长度相等。
Liberia ranks 138 on the 180-nation corruption index established by the good-governance group Transparency International.
VOA: standard.2009.08.14
After rising steadily for more than a year, the index of leading economic indicators actually slipped by .1 percent in April, according to a private research group.
VOA: standard.2010.05.20
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