单项选择题
A.用自来水清洗 B.用蒸馏水清洗 C.蒸汽清洗 D.烘干
A.≤0.5mg/L B.≤0.1mg/L C.≤0.05mg/L D.≤0.01mg/L
A.0~10mg/L B.0~30mg/L C.10~30mg/L D.30~50mg/L