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提问人:网友f******g 发布时间:2022年4月16日 23:58
[单项选择题]

栋舍内氨气浓度过大会造成猪只咳嗽等呼吸道症状,一般要求栋舍内氨气浓度不超过()mg/m3。

A.10

B.15

C.20

D.25

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