题目内容

3．关于指派问题的下列说法正确的是。

A. 指派问题是一个高度退化的运输问题
B. 可以用表上作业法求解指派问题
C. 从指派问题的效益矩阵中逐行取其最小元素，可得到最优分配方案
D. 匈牙利法所能求解的指派问题，要求规定一个人只能完成一件工作，同时一件工作也只给一个人做。

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整数规划类型包括。

A. 线性规划
B. 全整数规划
C. 纯整数规划
D. 混合整数规划
E. 0-1规划

在下列整数规划问题中，不可以采用分枝定界法的是。

A. 纯整数规划
B. 混合整数规划
C. 0-1规划
D. 全整数规划

1. ___A) It was built during wartime.B) It was destroyed during wartime.C) It was the only building in the city built long before the 1920s.D) It was the only building in the city that wasn't destroyed during war.2. A) They decided to keep the pub there forever.B) They destroyed the pub and refused to rebuild it.C) They tried to protect the pub as a historical place.D) They wanted to rebuild it using the original materials.3. _A) Because it was owned by a rich person.B) Because it was the only meeting place for people.C) Because it has always been standing there.D) Because it had a special place in the city’s history.

Section A1.A. Let's go now.B. Don't mention it.C. Sit down, pleaseD. Yes, I am.2.A. Yes, it is.B. All right.C. Sure, I willD. Never mind.3.A. Nice.B. Sure.C. I think so.D. Yes, please.4.A. Take it easy.B. Not at all.C. No, thank you.D. See you later.5.A. No problem.B. Go ahead.C. Here you are.D. Take care.6.A. Glad to meet you.B. Mind your head.C. Very nice.D. Quite convenient.7.A. See you again.B. Don’t be late.C. Don’t worry.D. I’d love to.