单项选择题 微分方程的图形称为微分方程的积分曲线.

单项选择题 The movie “Babel” referred to ____ A、expresses people’s ambition to explore the mystery of outer space. B、expresses the indifference and incomprehensibility among human being. C、describes the transformation of people from mental distance to mutual understanding, expresses people’s desire to communicate with each other.

单项选择题 框架柱中柱柱顶满足直锚时，其锚固长度为（        ）。 A、600mm B、1laE C、1.2laE D、梁高-保护层