phenolphthalin造句

例句与造句

1. A few drops of alcohol, then a few drops of phenolphthalin, and finally a few drops of hydrogen peroxide are dripped onto the sample.
2. A reduced form of phenolphthalein, phenolphthalin, which is colorless, is used in a test to identify substances thought to contain blood, commonly known as the Kastle-Meyer test.
3. It's difficult to find phenolphthalin in a sentence. 用phenolphthalin造句挺难的