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【单选题】
吗啡及合成镇痛药均具有镇痛活性,是因为A.
具有相似的疏水性
B.
具有相似的构型
C.
具有相同的药效构象
D.
具有相似的化学结构
E.
具有相似的电性性质
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知识点：
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【简答题】什么是最大的民生?
【单选题】In developed countries, tariffs on raw materials tend to be
A.
highest of all.
B.
higher than on manufactured goods.
C.
equal to tariffs on manufactured goods.
D.
lower than on manufactured goods.
【单选题】An important difference between tariffs and quotas is that tariffs
A.
raise the price of the good.
B.
generate tax revenue for the government.
C.
stimulate international trade.
D.
help domestic producers.
E.
are paid by foreign producers.
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