【单选题】I could see from his work that he had made a ______ study of his subject. Otherwise, he couldn't have made such a rapid progress.
【单选题】下列各项内容与黄土高原人地关系恶性循环示意图中代号相对应的是 [ ]
【单选题】由设计单位或建设单位提出的技术修改或工程变更,采用( )
【判断题】如果苹果和橙子是替代品,苹果价格上升使得橙子的需求减少。
【判断题】建筑群配线架CD到建筑物配线架BD间的距离不应超过两千米。
【简答题】下列选项中,三级基坑为开挖深度小于( )m,且周围环境无特别要求时的基坑。