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为跨度的0.5/1000 为跨度的1/1000 为跨度的2/1000 为跨度的3/1000
1/100 ~3/100 1/1000 ~3/1000 1/10000 ~ 3/10000
1/1000 3/1000 1/1000~3/1000 L/1000
2-5 %o 1-3 %o 3-4 %o 1-5 %。
1/1000~3/1000 2/1000~1/1000 1/1000~2/1000 2/1000~3/1000
1/1000~3/1000; 3/1000~5/1000; 3/1000~6/1000; 1/10000~3/10000; 3/10000~6/10000;
1/1000~3/1000 2/1000~1/1000 1/1000~2/1000 2/1000~3/1000