单词：unbalanced attenuator
不平衡衰减器
单词：unbalanced attenuator 相关文章
China's sex ratio is quite worrying nowadays. According to census data, China's sex ratio at birth was 108 males to every 100 females in the early 1980s, only slightly above the natural rate of 103 to 107. In 2000 the ratio was 116.9 males to 100 fem
发表于:2019-02-14 / 阅读(223) / 评论(0)
英闻天下
英闻天下