题目内容：
20. 社会问题
参考答案：
选择题：20. 社会问题
- 题目分类：社会学概论往年试题
- 题目类型：选择题
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[多选题,10分] 在线性规划问题中A23表示（ ）A.ii=2B.ii=3C.j=3D.ii=55
[多选题,10分] 在线性规划问题中A23表示（ ）A.ii=2B.ii=3C.j=3D.ii=55
线性规划的标准形有如下特征( )A.决策变量不为零B.决策变量无符号限制C.决策变量全为非负D.以上
线性规划的标准形有如下特征( )A.决策变量不为零B.决策变量无符号限制C.决策变量全为非负D.以上都不对
27.________ you are free tonight, why not drop in
27.________ you are free tonight, why not drop in and play chess with me? A、Fo
42.Are you from Italy? ____________. A、Yes, we are
42.Are you from Italy? ____________. A、Yes, we are B、No, we don’t C、No, I do
44.In addition to working a full day at his ______
44.In addition to working a full day at his ______ , he has to take care of his