BRT2/BRT3支撑环 d D t BRT2 BRT38 18 2 GN4773-V0 GN0725-V010 20 2 GN4774-V0 GN0733-V014 24 2 GN4775-V0 GN0745-V015 28 2 GN4776-V0 GN6445-V016 26 2 GN4777-V0 GN0751-V018 26 2 GN4778-V0 GN6377-V018 31 2 GN4779-V0 GN6446-V020 28 2 GN4780-V0 GN6447-V020 30 2 GN4781-V0 GN0762-V020 33 2 GN4782-V0 GN6448-V022 35 2 GN4783-V0 GN6449-V022.4 30 2 GN4784-V0 GN6450-V022.4 33 2 GN4785-V0 GN6451-V023.5 31.5 2 GN4786-V0 GN6452-V025 35 2 GN4787-V0 GN0781-V025 38 2 GN4788-V0 GN6453-V025.5 35.5 2 GN4789-V0 GN6454-V027 40 3 GN4790-V0 GN6455-V028 35.5 3 GN4791-V0 GN6456-V028 40 3 GN4792-V0 GN6457-V0