单项选择题
A.NH4ClB.NaClC.NaOHD.KI
A.18B.36C.12D.48
A.≤1mg/100gB.≤2mg/100gC.≤3mg/100gD.≤4mg/100g
A.≤10mg/m3B.≤25mg/m3C.≤50mg/m3D.≤12mg/m3
微信扫一扫,加关注免费搜题