The strength and deflection of putlog as easy supporting girder, and the ledger is over and supported by putlog.
杆按照简支梁进行强度和挠度计算，大杆
杆
上
。
搁材（putlog复数形式）The strength and deflection of putlog as easy supporting girder, and the ledger is over and supported by putlog.
杆按照简支梁进行强度和挠度计算，大杆杆上。
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