单项选择题
A.0.1mg/LB.0.3mg/LC.0.5mg/LD.0.7mg/LE.0.9mg/L
A.2000mg/kgB.200mg/kgC.40mg/kgD.20mg/kgE.4mg/kg
A.铅、汞、砷、pHB.铅、汞、砷、甲醇C.铅、砷、pH、甲醇D.铅、汞、砷、甲醛E.铅、砷、pH、甲醛