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【判断题】
如果对一种物品征税，并减少了销售量，税收就必定有无谓损失。()A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】必需氨基酸和非必需氨基酸(essential and non-essential amino acids)
【简答题】It is essential that these application forms ?It is essential that these application forms ______ back as early as possible. A) must be sent B) wi ll be sent C) are sent D) be sent
【简答题】It is essential that these application forms _____________ back as early as possible. A) must be sent B) will be sent C) are sent ...
【单选题】To drive a car safely, it is ________ good brakes.
A.
essential with
B.
essential having
C.
essential to have
D.
essential have
【简答题】必需基团(essential residues)
【简答题】essential element
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