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【简答题】
化合物A、B的分子式都是C 4 H 6 O 2 ，它们都不溶于NaOH溶液，也不与Na 2 CO 3 作用，但可使溴水褪色，有类似乙酸乙酯香味。它们与NaOH共热后，A生成CH 3 COONa和CH 3 CHO，B生成甲醇和羧酸钠盐C，该钠盐用硫酸中和后蒸馏出的有机物D可使溴水褪色。写出A、B、C、D的结构及有关反应方程式。
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【简答题】Back in the early 1900s, American physician Byron Robinson wrote a book proposing an interesting theory: humans actually have two brains --- one in our heads and the other in our stomachs, and the two...
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A.
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B.
光逆着地球公转方向返回的时间为l0/c-v
C.
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D.
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A.
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B.
Selecting a topic that does not interest you
C.
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D.
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【单选题】Who opposed the bill that was introduced in the House of Commons in the early 1900s
A.
Sir Robert Pearce
B.
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C.
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D.
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