步骤②中若改为加入4.2 g NaOH固体,沉淀物Y为Ca(OH) 2 和Mg(OH) 2 的混合物
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【单选题】听力原文:W: Good evening and welcome to tonight's program. Our guest is the world-famous Dr. Charles Adams, who has sparked a great deal of attention over the past several years for his research in the ar...
【单选题】听力原文:M: Are you going to listen to the guest speaker this evening? W: I certainly am. He's speaking on a topic close to my heart. Q: Why is the woman going to listen to the guest speaker? (16)
A.
Because she has nothing else to do that evening.
B.
Because she likes the man.
C.
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D.
Because she is interested in the topic of the lecture.
【单选题】听力原文:W: Good evening and welcome to tonight's program. Our guest is the world-famous Dr. Charles Adams. who has sparked a great deal of attention over the past several years for his research in the ar...