题目内容

有m个产地,n个销地,产销平衡的运输问题,m+n-1个变量构成基变量组的充要条件是它们不包含闭回路。

A. 对
B. 错

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运输问题中的位势就是其对偶变量。

A. 对
B. 错

The world is not just divided into good people and Death Eaters. We’ve all got both light and dark inside of us. ___________ matters is the part we choose to act on.

A. What
B. Where
C. That
D. Which

Every year, _______ makes the most beautiful kite will win a prize in the Kite Festival.

A. whatever
B. whoever
C. whomever
D. whichever

Happiness is ________ you think, what you say and what you do are in harmony.

A. what
B. where what
C. when what
D. that

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