????GB3087?е????ˉ????????????????????????????????????????????????ɡ????????????????о????????? λ???? ????????????????????????????????240?????????????250?????????????450??????????????????76????35%??????159-650????25%??????????????????190?????54%??????76?????5.7%??????????????15?????4.3%??????????й?????????5?????1.4%?? ????GB3087?е????ˉ????б????GB3087-1999???????ˉ???????? ????GB3087?е????ˉ??????????????????????ˉ???????????????????????ˉ?ù????????????????С?????????????????????????????Σ?????????????????????ˉ???????ˉ?????????????????????????10??20???? ????GB3087?е????ˉ????韁??????? ????

?????	??????????????
D1	??1.5%????С??0.75 mm
D2	??1.0%????С??0.50 mm
D3	??0.75%????С??0.30 mm
D4	??0.50%????С??0.10 mm