He cut a branch from a tree and made a whiffle-tree of it.
他根树枝,做
根拴挽带的横杆。
He cut a branch from a tree and made a whiffle-tree of it.
他根树枝,做
根拴挽带的横杆。
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度和挠度计算,大横杆小横杆的上面。
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