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【简答题】
有一列数如下：1，0，1，0，0，1，0，0，0，1，0，0，0，0，1，…，则第9个1在这列数中是第 个数．
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【单选题】The hostess attempted to __________ a romantic atmosphere in her 10th marriage anniversary.
A.
strive
B.
contrive
C.
conceive
D.
retrieve
【简答题】3-29 .已知线性回归模型 ,n=13 且k=3 (n 为样本容量,k 为参数的个数),由二次型 的最小化得到如下线性方程组: 要求:( 1 )把问题写成矩阵向量的形式;用求逆矩阵的方法求解之; ( 2 )如果 ; ( 3 )求出 的方差 —协方差矩阵。
【单选题】With the efforts to analyze the atmosphere in the 17th and 18th century, _____ such as hydrogen were discovered which in turn led to the invention of hydrogen balloons .
A.
gases
B.
elements
C.
air
D.
molecules
【单选题】With the efforts to analyze the atmosphere in the 17th and 18th century, ______ such as hydrogen were discovered which in turn led to the invention of hydrogen balloons.
A.
substances
B.
elements
C.
gases
D.
air
【简答题】Read the following passage and translate it into Chinese. The nitrogen cycle consists of a sequence of biochemical changes wherein nitrogen is used by living organisms, transformed upon death and deco...
【单选题】With the efforts to analyze the atmosphere in the 17th and 18th century, _____ such as hydrogen were discovered which in turn led to the invention of hydrogen balloons .
A.
gases
B.
elements
C.
air
D.
substances
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