nn指示剂的英文

• calred
• calconcarboxylic acid

• 指示剂:    indicator; tracer agent
• 指示剂:    phindicatorph; tracer agent; visual indicator
• 指示针；指示剂:    indicator
• ph指示剂,酸碱指示剂:    ph indicator
• 指示器指示剂:    indicator