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【简答题】
数域K上的n个方程的n元线性方程组x1α1+x2α2+…+xnαn=β对任何β∈Kn都有解的充分必要条件是它的系数行列式｜A｜≠0．
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举一反三
【单选题】There was a fire last night, but the firemen _____ soon. [ ]
A.
put down it
B.
put it down
C.
put out it
D.
put it out
【单选题】Which of the following transitional devices is not correctly used?
A.
While they are new here, they know nothing about the place.
B.
Chinese prefer to show a child how to do it, while the westerners tend to leave the children alone to have a go on their own.
C.
British students care more about their performance in sports, Chinese students whereas often put their first priority in academic results.
D.
Although they have been here for a long time, but they know nothing about the place.
【单选题】随着下属人员的成熟度由较低转为较高，管理者的领导风格以及其他相关的管理措施应作以下哪一种调整?______
A.
管理者可以赋予下属自主决策和行动的权力，管理者本人只起监督作用。
B.
管理者应通过双向沟通方式与下属进行充分交流，对下属工作给予更多的支持而不是直接指示。
C.
管理者应改进沟通以便更加有效地指导和推进下属的工作。
D.
管理者应采取单向沟通方式进一步加强对下属工作的检查、监督，使他们继续发展。
【单选题】—Why is she feeling down today? —Because the suggestion he ____ has been turned down.
A.
put away
B.
put up
C.
put down
D.
put forward
【单选题】Which of the following is NOT transitional word or phrase?
A.
for example
B.
furthermore
C.
in recent years
D.
by contrast
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