判断题

计算表面积时插值间隔要根据地形情况决定，不宜过大？

答案：正确

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多项选择题

Racial issue is a serious problem in the United States, with the following groups and communities of minorities often being victims of discrimination and injustice: __________.( ) A. white (immigrants from European countries, especially from West Europe) B. Native Americans C. African Americans (black people) D. Hispanics (immigrants from Mexico, the Caribbean or other Latin American countries)

单项选择题

陶瓷表面越粗糙，测得的抗弯强度（）。 A. 越低 B. 越高 C. 先增高后降低 D. 无关