问题
填空题
变量间的关系指两个或两个以上的变量相联系的性质,它们主要有相关关系、()关系、()关系3种类型。
答案
参考答案:因果;虚无
变量间的关系指两个或两个以上的变量相联系的性质,它们主要有相关关系、()关系、()关系3种类型。
参考答案:因果;虚无
从方框中选择词组并用其适当形式完成下列句子,其中有两词多余。 | |
2. He is going to be a doctor when he ______. 3. — Why didn't you go to watch the match yesterday? — Oh, my sister was ill and I _____ her at home. 4. Miss Zhang walked into the room and _____ the lights. 5. My brother is a student in a university and _____ European history. |