文章报道了NPAH的合成及作为酸-碱指示剂的应用。将其与甲基红比较,结果一致。证明是一种良好的酸-碱指示剂。变化范围在pH5.58(红......

...

Relativization is a common feature shared by almost every language,which also needs to be analyzed from the contrastive ......