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