问题
填空题
测定水样的碱度时,可测得酚酞碱度,但再加入甲基橙指示剂时无反应,可判断该水样中()碱性离子。
答案
参考答案:只含有OH-
测定水样的碱度时,可测得酚酞碱度,但再加入甲基橙指示剂时无反应,可判断该水样中()碱性离子。
参考答案:只含有OH-
用方框中所给单词的适当形式填空。每词限用一次。
小题2:On a night, some children went camping in the forest. 小题3:The Yellow River is the second river in China. 小题4:The school leavers’ party will be this Saturday. 小题5:Listen up! There’re a few and suggestions before we climb the mountain. |