产品中H2O2含量测定时，可用盐酸调节酸度。

产品中H2O2含量测定时，加入的指示剂是淀粉。

未知题型产品中H2O2含量测定时，加入的指示剂是淀粉。

The similarity between the Bridge of Signs and its Vene...

判断题The similarity between the Bridge of Signs and its Venetian namesake is that both of them are designed by the same designer.

制备过碳酸钠过程中，碳酸钠要配制成饱和溶液。

未知题型制备过碳酸钠过程中，碳酸钠要配制成饱和溶液。