在采煤工作面平行作业时,装药与打眼的距离不得小于()m。 ["10","15","20","30"]
风险分析(估计)是指系统地运用相关信息来确认风险的来源,并对各主要因素风险的()进行估计。 ["发生概率","影响范围","风险程度","发生时间"]
下面的哪些程序片断可能导致错误() ["String s = "Gone with the wind"; String t = " good "; String k = s + t;","String s = "Gone with the wind"; String t; t = s[3] + "one";","String s = "Gone with the wind"; String standard = s.toUpperCase();","String s = "home directory"; String t = s - "directory""]
对住宅建筑的规划设计应考虑的因素为()。 ["用地条件","选型","朝向","空气质量","群体组合"]
老年人易发生脊柱畸形和骨折,是因为老年人缺乏() ["铁","钙","硒","氟"]
什么是农业承包合同,它应该具备什么条件?