The strength and deflection of putlog as easy supporting girder, and the ledger is over and supported by putlog.
横杆按照简
行强度和挠度计算，大横杆在横杆的上面。
架的横木The strength and deflection of putlog as easy supporting girder, and the ledger is over and supported by putlog.
横杆按照简行强度和挠度计算，大横杆在横杆的上面。
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