氯化物检查法中使用的试剂有
A.稀硝酸
B.25%氯化钡溶液
C.硫代乙酰胺试液
D.碘化钾试液
E.硝酸银试液
参考答案:A,E
The company launched a large advertising ________ for their new products.[ ]
A. camp
B. campaign
C. campus
D. fight
球磨机中研磨体填充一般控制在()
A、20~30%
B、25~35%
C、30~40%