单项选择题

一个后缀表达式 2 3 * 6 5 * + 2 1 / - 的计算结果是（）。

A． 31
B． 32
C． 33
D． 34

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单项选择题

服药、注射、给药前必须严格执行“三查八对”。

A.正确
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单项选择题

Generalized System of Preferences (GSP) is a preferential tariff system that extended by developing countries (also known as donor countries) to developed countries (also known as beneficiary countries). It involves reduced MFN tariffs or duty-free entry of eligible products exported by donor countries to the markets of beneficiary countries.
A、正确
B、错误