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ratio of drawing中文是什么意思

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用"ratio of drawing"造句"ratio of drawing"怎么读"ratio of drawing" in a sentence

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例句与用法

  • The test results show that the drawing interval of 1 . 5 m is helpful for controlling dead - unconsolidated thin sandstone of coal seam roof and reduce sand ratio of drawn top - coal
    试验结果表明,放煤步距采用三采一放有利于控制顶板极松散细砂岩,降低放出顶煤的含砂率。
用"ratio of drawing"造句  
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