Development of an automatic measurement instrument for the filter function of special light filter 特種濾光片濾光特性批量測試儀的研制
Development of high stability and narrow band standard interference light filter for enzyme content analyzer 酶標(biāo)分析儀高穩(wěn)定度窄帶標(biāo)準(zhǔn)干涉濾光片的研制
Almost no light filtered through the great dull clouds which hovered like heavy dumplings in the sky and seemed to presage many hours of snow 空中暗云低徊,陰沉沉的一片,一縷陽光也透不過來,看樣子這雪還得下好幾個(gè)鐘頭哪。