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rattlebrain    
n. 头脑空虚的人,愚蠢多嘴的人

头脑空虚的人,愚蠢多嘴的人


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    Hello all, I was hoping someone can shed some light on the topic of differential deflection of a crane runway beam for me I have a situation where the runway beam on one side of the building is spanning 28' and on the other it is supported by a 130' clear span truss These runway beams are
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