focusing lens是什么意思

用法例句

A novel high-luminosity LED railway annunciator composed of LED array and lens array was studied and developed.

研制了一种新型LED阵列和相匹配的聚光透镜阵列构成的高亮度LED铁路信号机光学系统。

A novel method of preparing pyrazolo[1,5-a][1,3,5]triazin-4(3H)-one derivatives((9a~9c)) has been developed by cyclization of amidine pyrazol intermediates with triphosgene at low temperature.

设计并实现了以具有脒代吡唑结构的中间体与三聚光气在低温下进行分子内环合得到吡唑并三嗪[1,5-a][1,3,5]-4(3H)-酮衍生物(9a~9c)的新方法。

a - (2 - Thiazolylureido) - alkylphosphonk: aeid diphenyl esters (3) were synthesized by the reaction of (substituted) 2 - arnino(benzo)thiazole with a - isocyanatoalkylphosphonic acid diphenyl esters (2 ) , which were prepared in one - pot by treating a - aminoalkylphosphonie acid diphenyl esters(l) with triphosgene.

在二氯甲烷中,三乙胺为缚酸剂的条件下,α-氨基膦酸二苯酯与三聚光气反应形成α-异氰酸基膦酸酯2,2不经分离,直接与2-氨基(苯并)噻唑加成得到α-(2-噻唑基脲基)膦酸二苯酯3,产率55。