英语词汇“safety board”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	safety board
释义	safety board safety board [′sāf·tē ‚bȯrd] (petroleum engineering) A board placed in a derrick for a worker to stand on when handling drill rods at single, double, triple, or quadruple levels; the boards are placed at suitable heights to handle a stand of drill rods for that number of joints.
随便看	spondylitis ankylopoietica spondylitis, ankylosing spondylitis association of america spondylitis deformans spondylitis, rheumatoid spondylitis tuberculosa spondylitis typhosa spondylizema spondylo- spondyloarthritis spondyloarthrocace spondyloarthropathies spondyloarthropathy spondylocace spondylocarpotarsal syndrome spondylocarpotarsal synostosis syndrome spondylocostal dysostosis, autosomal recessive spondylocostal dysostosis, autosomal recessive 1 spondylocostal dysostosis type 4 spondylodymus spondylodynia spondyloepimetaphyseal dysplasia missouri type spondyloepimetaphyseal dysplasia, strudwick type spondyloepimetaphyseal dysplasia with joint laxity spondyloepiphyseal dysplasia

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