直径d理论重量(kg/m)直径d理论重量(kg/m)直径d理论重量(kg/m)5.50.186* 274.49* 6828.560.222284.837030.26.50.26* 295.187534.770.302305.558039.580.395* 315.928544.590.499326.319049.9100....