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重寫句子：Not until he crossed the line and felt the tape snap against his chest did Johnson know he had won the race.(loose sentence)
Johnson did not know he had won the race until he crossed the line and felt the tape snap against his chest.
暫無解析
什么是空壓機(jī)的轉(zhuǎn)速？
DK630-4-12型道岔的曲率半徑是12米。
井下空壓機(jī)和風(fēng)包可以設(shè)在一個硐室內(nèi)
平巷轉(zhuǎn)運材料、矸石車,人工推車時1次只準(zhǔn)推1輛車，嚴(yán)禁在礦車兩側(cè)推車。
采掘工作面的進(jìn)風(fēng)流中二氧化碳濃度不超過（）。
