未知题型 某单层乙醇合成厂房，耐火等级为一级，建筑面积为2000m2。已知乙醇的闪点为13℃，沸点是78．3℃，熔点是-114．1℃，自燃点是423℃，则该厂房的火灾危险性类别为（）。A.甲类B.乙类C.丙类D.丁类

单项选择题 The following information has been tanken or calculated from Fowler's financial statements for the year ended 30 September 20X5: Cash cycle at 30 September 20X5 70 days Inventory turnover six times Year-end trade payables at 30 September 20X5 2 million Cost of sales for the year ended 30 September 20X5 $1.8 million What is Fowler's trade receivables collection period as at 30 September 20X5?The following information has been tanken or calculated from Fowler's financial statements for the year ended 30 September 20X5:

单项选择题 .设网中的顶点数为n,边数为e，则普里姆(Prim)最小生成树算法和克鲁斯卡尔(Kruskal)最小生成树算法的时间复杂度分别为(） A、O(n2 )，O(n2 ) B、O(n2 )，O(eloge) C、O(n2 )，O(nlogn) D、O(nlogn) ，O(eloge)