防冻内齿套管内径每卷长度，单位米FD-0.5￠2.2142FD-0.6￠2.5130FD-0.75￠2.8117FD-1.0￠3.0111FD-1.25￠3.2105FD-1.5￠3.4100FD-2.0￠3.691FD-2.5￠3.980FD-3.5￠4.277FD-4.0￠4.667FD-5.5￠5.265FD-6.0￠5.460FD-8.0￠6.252)