问答题

煤的物理性质包括煤的[填空1]、力学性质，及其他性质

答案：第1空:光学性质

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FANUC系统数控车床的G50是[填空(1)] 。

答案：设定工件坐标系指令

单项选择题

________ refers to the ability of a party (an individual, a firm, or a country) to produce a particular good or service at a lower opportunity cost than another party.

A．Commercial advantage
B．Natural advantage
C．Absolute advantage
D．Comparative advantage