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【判断题】
产地个数为m销地个数为n的平衡运输问题的系数矩阵为A，则有r(A)≤m+n－1A.
正确
B.
错误
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举一反三
【单选题】The development of a thoroughly effective treatment for narcolepsy is regarded by the author as
A.
possible, but not very important
B.
interesting, but too costly to be practical
C.
promising, but many years off
D.
extremely unlikely
E.
highly probable
【单选题】With which of the following generalizations regarding management structures would the author of the passage most probably agree?
A.
Hierarchical management structures are the most efficient management structures possible in a modern context.
B.
Firms that routinely have a high volume of business transactions find it necessary to adopt hierarchical managemnt structures.
C.
Hierarchical management structures cannot be successfully implemented without modern communications and transportation.
D.
Modern multinational firms with a relatively small volume of business transactions usually do not have hierarchically organized managemnt structures.
E.
Companies that adopt hierarchical management structures usually do so in order to facilitate expansion into foreign trade.
【简答题】有威信的 auth
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