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【多选题】
下列坐标系统属于地心坐标系统的是( )。A.
WGS-84
B.
1954北京坐标系
C.
1980年西安坐标系
D.
ITRF
E.
2000国家大地坐标系
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【单选题】用单纯型法求解 极大值 线性规划问题时,如果所有检验数均小于等于零,其中存在某个非基变量检验数等于零,则该问题( ) 。
A.
无可行解
B.
有无界解
C.
有无穷多最优解
D.
有唯一最优解
【简答题】对于目标函数极大值型的线性规划问题,用单纯型法求解时,当基变量检验数δ j 0时,当前解为最优解。
【单选题】If you use material that does not belong to your company or organization you must
A.
get copyright permission
B.
acknowledge your sources
C.
hope no one notices
D.
pay a fee
【简答题】对于目标函数极大值型的线性规划问题,用单纯型法求解 时,当基变量检验数 时,当前解为最优解。
【单选题】What is the most necessary material you need to submit if you want to apply to an undergraduate degree?
A.
the original or certified copies of his secondary school transcripts or mark sheets
B.
certified copies of his college transcripts or mark sheets
C.
high scores on the TOEFL and IELTS
D.
GMAT scores
【判断题】If you gather material about your topic before you have completed the supporting points of your outline, you will be wasting your time because you might not use all of the information you find.
A.
正确
B.
错误
【单选题】If you mark a book too much, the important material wont stand out, and you will be just ____confused as if you had not marked anything at all.
A.
so
B.
less
C.
more
D.
as
【单选题】用单纯型法求解 极大值 线性规划问题时,如果所有检验数均小于等于零,其中存在某个检验数等于零,则该问题( ) 。
A.
无解
B.
有无界解
C.
有多重最优解
D.
有唯一最优解
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