镀锌管规格规格外径mm称内径DN15DN20DN25DN32DN40DN50DN65DN80DN100DN125DN150DN200DN200壁厚mm2.82.83.23.53.53.84444.54.56.06.5内径英寸1/23/411.251.522.534568821.326.933.742.448.360.376.188.9114.3140168.3219.1219.130.538.944.856.572.184.9110.3135.5163.8213.1212.6DN25DN32DN40DN50DN65DN80DN100DN125DN150DN200DN200