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【判断题】
运输问题的数学模型是线性规划模型，且该问题必定存在最优解。A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】If we come ______ terms, we'll appoint you as our agent.
【单选题】If the straggle for a sustainable society______, we must have some vision of what we are aiming for.
A.
is to succeed
B.
has succeeded
C.
succeeds
D.
succeeded
【单选题】If the struggle for a sustainable society _____, we must have some vision of what we are aiming for.
A.
is to succeed
B.
has succeeded
C.
succeeds
D.
succeeded
【简答题】We must appoint somebody to act as secretary.
【简答题】简述影响商品价格的社会心理因素有哪些?
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