单项选择题 1. 某成年患者，患病后变得依赖性很强，超出了他的病情状况和年龄特征，该患者运用的心理防卫机制是（ ）。A. 压抑 B. 否认 C. 补偿 D. 合理化 E. 退化

多项选择题 In the part where the author wanted to show us the changeless village life before the installation of the telephone, he chose the details to respectively tell ______.（ ）A.how the villagers lived their changeless life B.how they kept track of time and important events without the help of a watch or a calendar.C.how the villagers came to have a telephone D.what a sensation the installing process created

未知题型 (共用题干) 有五个不同职业人群的冠心病患病率资料，若比较职业不同患病率是否相同。统计学检验的无效假设应是