哪位有关于钢铁塔的设计资料,可否提供些,另外求个美国标准TIA / EIA - 222 这个是标准名称 Structural Standards for Steel Antenna Towers and Antenna Supporting Structures
这个是标准名称 Structural Standards for Steel Antenna Towers and Antenna Supporting Structures
哪位有关于钢铁塔的设计资料,可否提供些,另外求个美国标准TIA / EIA - 222 这个是标准名称 Structural Standards for Steel Antenna Towers and Antenna Supporting Structures
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