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木梁
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木梁
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工学
木结构
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timber beam
木梁
一般在工程结构中水平设置,通常承受竖向荷载作用,荷载作用下的内力以弯矩和剪力为主的构件。是木结构中的基本单元。
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seawater pH meter
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sea water quality standard
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sea water sampling
seawater scatterance meter
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seawater temperature observation
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Sea Wave
sea wave
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sea waybill
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