单项选择题

According to Adam Smith in his The Wealth of Nations (1776), trade between nations is beneficial if it is based on_______.
A、Absolute advantage
B、 Comparative advantage
C、 Trade surplus
D、Free trade

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多项选择题

Choose the suitable sentences while asking people for an order.
A、Are you ready to order?
B、I think you’ll like it.
C、What can I get you?
D、It’s a kind of spicy.

单项选择题

G00指令不能用于粗加工切削。
A、正确
B、错误