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【简答题】
有机物A（C 6 H 8 O 4 ）为食品包装纸的常用防腐剂。A可以使溴水褪色。A难溶于水，但在酸性条件下可发生水解反应，得到B（C 4 H 4 O 4 ）和甲醇。通常状况下B为无色晶体，能与氢氧化钠溶液发生反应。 （1）A可以发生的反应有_____________（填序号） ①加成反应 ②酯化反应 ③加聚反应 ④氧化反应 （2）B分子所含官能团的名称是_____________、_____________； （3）B分子中没有支链，其结构是___________________。 （4）由B制取A的化学方程式是_____________________________________ （5）天门冬氨酸（C 4 H 7 NO 4 ）是组成人体蛋白质的氨基酸之一，可由B通过以下反应制取 天门冬氨酸的结构是_____________。
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举一反三
【单选题】_____ of the three buses can take you to the Palace Museum, so you can get there easily.
A.
Either
B.
All
C.
Neithe r
D.
None
【单选题】变压器是一种静止的电气设备，它可以将一种
A.
电压转换为另一种电流
B.
电流转换为另一种电压
C.
电压和电流的交流电转换为同频率的另一种电压和电流
D.
电压和电流的交流电转换为不同频率的另一种电压和电流
【简答题】B Ma is only forty miles from Hong Kong and it is easy to reach. You can get there by sea. It is an interesting place and it had a long history. Ma is part of China and most people living there ...
【单选题】The bank is ______ the street, so go ______ the underground passage， and you can get there.
A.
through; across
B.
through; into
C.
across; over
D.
across; through
【简答题】Ma() is only forty miles from Hong Kong and it is easy to reach. You can get there by sea. It is an interesting place and it had a long history. Ma is part of China and most people living ther...
【简答题】Ma is only forty miles from Hong Kong and it is easy to reach. You can get there by sea. It is an interesting place and it had a long history. Ma is part of China and most people living there ar...
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