double colored indicator 双色液位计
colored indicator 显色指示剂
We can measure the calcium content of the colored or turbid drink using the method of taking calcium electrode as indicator electrode and calomel electrode as reference electrode.
提出了以钙电极为指示电极，甘汞电极为参比电极的方法测有色或浑浊饮料中钙含量。
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