A.樣品中有明水時,應(yīng)劇烈搖動,使其充分混勻B.實驗前應(yīng)檢查電解池是否密封C.進樣時微量注射器針尖應(yīng)高于液面上1厘米D.試樣中有少量機械雜質(zhì)可以用濾紙過濾
A.240B.320C.360D.400
A.10B.50C.100D.200