【简答题】环境中常见的原生动物分为 纲 、 纲和 纲。
【多选题】对于屋面雨水的排除方式,有组织排水的排水方式包括()
【单选题】We had warned him ____________ of his carelessness. Now we will have to fire him.
【判断题】科目汇总表账务处理程序下所编制的科目汇总表,能起到总账户试算平衡的作用。( )
【判断题】科目汇总表账务处理程序下所编制的科目汇总表,能起到总账试算平衡的作用。( )
【单选题】We had warned him() the danger but he turned a deaf ear to our warning.
【简答题】He burned his fingers badly, though we warned him against it. He lost nearly all his money he had invested.
【判断题】几个相同的电流源可以并联,但不可以串联。
【单选题】据考古发现,在战国中晚期墓葬中,河北兴县一次出土铁范87件,大多为农具范。河南新郑铸铁作坊遗址出土陶范300余件,其中农具范占60%以上,出土铁农具200多件,占全部铁器的5%.这些考古资料证明战国中晚期 ( ) A. 铁器已开始用于农业生产 B. 铁农具的使用已很普遍 C. 铁器牛耕成为古代主要农耕方式 D. 铁农具制作技术臻于成熟