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【单选题】
对于线性规划问题【图片】为其约束条件，B为A的一个【图片】的基，则B的可行基解【图片】成为极大值问题最优解的条件（ ）。A.
且变量取值为0
B.
且变量取值大于0
C.
且变量取值可以为0
D.
且变量取值小于0
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举一反三
【单选题】Section B Directions: This section is to test your ability to understand short dialogues. There are 5 recorded dialogues in it. After each dialogue, there is a recorded question. The dialogues and que...
A.
￡24.
B.
￡12.
C.
￡20.
D.
￡14.
【单选题】The passage suggests that the early shops for making tools were______.
A.
not very sophisticated.
B.
known for doing very quick work.
C.
dependent on imported materials.
D.
frequented only by fashionable people.
【单选题】What tools were used to dig holes to lay the wooden stumps?
A.
Cow jaw-bones.
B.
Sharp rocks
C.
Aliens
D.
Deer antlers
【简答题】A．The clay was placed in molds. B．Special tools were used to shape the clay. C．Each person was responsible for a particular part of the process. D．It was created on pottery wheels.
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