单项选择题
A.1±0.2,(0±5)µg/m3,≥0.93B.1±0.2,(0±5)µg/m3,≥0.95C.1±0.1,(0±5)µg/m3,≥0.93D.1±0.1,(0±5)µg/m3,≥0.95
A.≥600hB.≥700hC.≥800hD.≥900h