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huangyhg

2009-09-15 03:03 PM

properties of a 20j8

properties of a 20j8
i need to know the properties of a 20j8 joist. this is on a plan from '72. anyone have an idea? anyone know where i could see a catalog or manual regarding older shapes?

所有的时间均为北京时间。现在的时间是 12:27 PM.