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【多选题】
企业采用信息技术后的信息流特点是A.
信息流的采集与物流的过程同时发生
B.
信息采用计算机集中存储，统一加工处理，消除了部门与部门交接处的冗余加工处理
C.
用计算机加工处理信息及时准确
D.
能快速反馈信息并由此控制和调节物流
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举一反三
【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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