是指的线的型号。7号比4号粗常用线号拉力值对照表如下:线号直径拉力(kg)0.40.104~0.1050.88~1.330.60.1281.51~1.800.80.1481.8~2.301.00.1652.2~3.01.20.1812.6~3.61.50.203~0.2053.2~4.52.00.225~0.2354.10~5.402.50.25~0.265.1~6.13.00.2856.0~7.23.50.309~0.3106.8~8.24.00.330~0.3317.8~11.25.00.370~0.3759.9~13.36.00.375~0.40511.4~13.4【鱼在水户外为您解答】