单项选择题

‏四维随机向量其协方差数矩阵的特征值是,提取两个主成分用于做综合评价，综合得分Z计算公式是什么？‍

A．
B．其他
C．
D．
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单项选择题
求如下网络中的最小费用最大流的费用，其中弧旁数字为 <img src= https: static.zxtiku.com wangke imgs topic a385c52ebe816f929262b08fb6b3432b.png
A．56
B．90
C．87
D．73
单项选择题
If someone is asked to recall a warm experience with her mother and then asked to fill l_v_ to make a word, she is more likely to write love rather than live. This is a phenomenon called…
A．Procedural memory
B．Dispositional memory
C．Semantic memory
D．Episodic memory
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