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【单选题】
关于线性规划的最优解判定，说法不正确的是（）A.
如果是求目标函数最小值，则所有检验数都大于等于零的基可行解是最优解
B.
如果是求目标函数最大值，则所有检验数都小于等于零的基可行解是最优解
C.
求目标函数最大值时，如果所有检验数都小于等于零，则有唯一最优解
D.
如果运算到某步时，存在某个变量的检验数大于零，且该变量所对应约束方程中的系数列向量均小于等于零，则存在无界
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【简答题】Match the purpose of visit with the proper types of visa.
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A.
status quo
B.
volatile
C.
executive summary
D.
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A.
to advertise a job
B.
to launch a new product
C.
to announce new opening times
D.
to publicise a sale
E.
to announce a change in location
F.
to change the company's image
G.
to give information about sales figures
H.
to promote a catalogue
【单选题】Task Two—Purpose of advertisement ?For questions 18-22, match the extracts with the purposes, listed A-H, ?For each extract, choose the purpose of the advertisement. ?Write one letter (A-H) next to th...
A.
to advertise a job
B.
to launch a new product
C.
to announce new opening times
D.
to publicise a sale
E.
to announce a change in location
F.
to change the company's image
G.
to give information about sales figures
H.
to promote a catalogue
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