(单选题)37: 硼酸的分子式为H3BO3,所以它是
A: 三元酸
B: 二元酸
C: 一元弱酸
D: 一元强酸
E: 三元弱酸
1.(text)I.VocabularySkills(2points)Whichofthewordsbelowcontainaprefixwithanega...
1.(匹配题)I.Vocabularyskills(3points) Lookatthecolumnsbelow.Matcheachvocabular...
1.(完形填空题)1.ListentotheconversationanddecidewhetherthefollowingisT(true)orF...
1.(完形填空题)1.ListentotheconversationanddecidewhetherthefollowingisTrue(T)orF...
1.(完形填空题)1.ListentotheconversationanddecidewhetherthefollowingisTrue(T)orF...