题目内容

在有向图中判断是否存在回路常用的算法是____________。

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1. Listen to a story about Jack’s fear and decide whether the following statements are T (true) or F (false).[音频]1. When Jack gets into bed, he thinks there’s somebody hiding under the bed.2. As Jack lies under the bed, there must be somebody sleeping on top of it.3. The doctor asks Jack to see him three times a week for two years to cure his fears.4. The doctor charges Jack $200 a visit.5. Jack is willing to pay the amount the doctor charges.

建设工程竣工验收后，在规定的保修期内，因勘察、设计、施工、材料等原因造成的质量缺陷，应当由负责维修、返工或更换，由责任单位负责赔偿损失。

建设工程承包单位在向建设单位提交工程竣工验收报告后，应当向建设单位出具。

施工单位对施工中出现质量问题的建设工程或者竣工验收不合格的建设工程，应当负责。