开挖槽、坑、沟深度超过1.5米，应根据土质和深度情况按规定编制施工专项方案，并设置人员值班。开挖深度超过2米，必须在边沿处设立警示标志围挡。危险处，夜间应设警示灯。()

判断题Most of Saul Bellow‘s heroes are Jewish intellectuals or writers who try to discover the queerness of existence .()

判断题Human goodness is one of the most familiar themes in American naturalism .()

判断题The Adventures of Huckleberry Finn reflects the moral growth of Tom Sawyer .()

判断题Irving was best known for his short stories such as Rip Van Winkle .()

判断题Fitzgerald shows an interest both in upper–class society & lower–class society .()