The strength and deflection of putlog as easy supporting girder, and the ledger is over and supported by putlog.
小横
简支梁进行强度和挠度计算，大横在小横
上面。
复数形式）The strength and deflection of putlog as easy supporting girder, and the ledger is over and supported by putlog.
小横简支梁进行强度和挠度计算，大横在小横上面。
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