单项选择题 全应力在截面法线上的投影称为（ ）. A、应力 B、正应力 C、切应力 D、轴力

单项选择题 惟有相互了解，国与国才能增进信任，加强合作。______    A．Without mutual understanding, it is impossible for countries to build trust and promote cooperation with one another.    B．It is mutual understanding which makes it possible for countries to build trust and promote cooperation with one another.    C．Only mutual understanding can be one way for countries to build trust and promote cooperation with one another.    D．Mutual understanding is one way only for countries to build trust and promote cooperation with one another.

单项选择题 洞庭湖区的民间传统舞蹈整体上以细腻,传神,模仿水中动物的表演为主，多以歌舞演唱的形式表现活泼、抒情的情绪风格。（ ） A. 对 B. 错