The strength and deflection of putlog as easy supporting girder, and the ledger is over and supported by putlog.
小横杆按照简支梁进行强
和
算，大横杆在小横杆
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.
小横杆按照简支梁进行强和算，大横杆在小横杆上面。
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