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【判断题】
配位滴定只能测定高价的金属离子,不能测定低价金属离子和非金属离子。( ).A.
正确
B.
错误
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举一反三
【简答题】根据短文内容和首字母提示，把所缺单词填写在短文后面相应的横线上，使句意完整。 It's very important for us to keep (1)h______ in our everyday life. Here is some (2)a______ for you. First, you should have healthy diet. Different food helps us...
【简答题】为什么计算断后伸长率和断面收缩率时分母均使用试样原始的长度和面积?
【单选题】In the U.S., it's ( ) for children to get smallpox shots because the disease no longer exists today.
A.
required
B.
important
C.
unnecesary
【单选题】It's important for the figures ________ regularly. [ ]
A.
to be updated
B.
to have been updated
C.
to update
D.
to have updated
【简答题】根据句意和首字母提示完成句子。 1. I have a toothache, I have to see a d _____ _. 2. —What's the matter with you? —I have a s ______ throat. 3. It's important for us to have a healthy lifestyle, to eat a b ______ die...
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