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【单选题】
关于隧道施工过程中作业环境应符合的职业健康及安全标准，不正确的是（）。A.
空气中氧气含量，按体积计不得小于20％
B.
粉尘容许浓度，每立方米空气中含有10％以上的游离二氧化硅的粉尘不得大于2mg，每立方米空气中含有10％以下的游离二氧化硅的矿物性粉尘不得大于4mg
C.
瓦斯隧道施工通风应符合现行铁道部《铁路瓦斯隧道技术规范》（TBl0120）的有关规定
D.
隧道内噪声不得大于120dB
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directly
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