【判断题】枝状管网简单,每一管段的流向都是确定不变的,管道的直径距热源越远而逐渐减小,投资小,运行管理简便。枝状管网不具有后备供热的性能。
【简答题】在 HTML5 中,( )元素用于定义包含多个选项的下拉菜单。
【简答题】阅读理解 Once there was a boy. He loved sweets very much. He always asked his father for sweets. The boy's father thought hard about how to stop the child from asking for so many sweets. A great man lived...
【判断题】管道运输经营管理比较简单,但运输货物过于单一,永远是单向运输,机动灵活性小。