He cut a branch from a tree and made a whiffle-tree of it.
他砍了一根树枝，做了一根拴挽带的
。
He cut a branch from a tree and made a whiffle-tree of it.
他砍了一根树枝，做了一根拴挽带的。
The strength and deflection of putlog as easy supporting girder, and the ledger is over and supported by putlog.
按照简支梁进行强度和挠度计算，大
的上面。
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