不定项选择

理想晶体形态上，同形等大、性质相同的晶面组成一个单形。‏

A．正确
B．错误

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单项选择题

‌A ________ is anything that can be offered to a market to satisfy a want or need, including physical goods, services, experiences, events, persons, places, properties, organizations, information, and ideas.‏
‌‏

A．function
B．process
C．benefit
D．product

多项选择题

触电的方式有以下哪几种？ A.
两相触电 B.
单相触电 C.
三相触电 D.
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