The strength and deflection of putlog as easy supporting girder, and the ledger is over and supported by putlog.
横
简支梁进行强度和挠度计算，大横在横的上面。
The strength and deflection of putlog as easy supporting girder, and the ledger is over and supported by putlog.
横简支梁进行强度和挠度计算，大横在横的上面。
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