缩合鞣质与乙酸铅的反应现象是()
A.不产生沉淀
B.生成沉淀,沉淀可溶于稀乙酸
C.生成沉淀,沉淀不溶于稀乙酸
D.生成沉淀,沉淀可溶于稀碱液
参考答案:B
This is the second time that the top 10 list of popular novels _____ published by this magazine. [ ]
A. has been
B. are
C. is
D. have been
厢式压滤机压紧方式一般为()。
A、单油缸
B、双油缸
C、多油缸