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【简答题】
n元齐次线性方程组的系数矩阵A的秩为r,那么如果r n,则方程组仅有零解;如果r n,则方程组除零,还有非零解.
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举一反三
【单选题】________ is used in making raft foundations and pile foundations.
A.
Plain Cement Concrete
B.
Reinforced Cement Concrete
C.
Prestressed Cement Concrete
D.
Ferro-Cement
【简答题】教材P50,2-10
【单选题】The Public Broadcasting System is supported by donations from foundations and other sources.
A.
grants
B.
references
C.
accounts
D.
advertisements
【单选题】Which of the following is the best description of why it is important to learn about the foundations for big data?
A.
Foundations allow for the understanding of practical concepts in Hadoop.
B.
Foundations help you revisit calculus concepts required in the understanding of big data.
C.
Foundations is all that is required to show a mastery of big data concepts.
D.
Foundations stand the test of time.
【简答题】p50 1
【单选题】It is implied in the last paragraph that some foundations are used by the rich to ______.
A.
provide shelter for the poor
B.
build good fame
C.
avoid paying tax
D.
support their business
【单选题】?Read the article below about foundations of business. ?Choose the correct word or phrase to fill each gap from A, B, C, or D ?For each question 21—30, mark one letter (A, B, C, or D) on your Answer S...
A.
connected
B.
united
C.
combined
D.
joined
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