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【简答题】
A为实n阶矩阵，则A+A'为对称矩阵． A为实n阶矩阵，则A-A'为对称矩阵？
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反馈参考答案：
举一反三
【简答题】I have (hold)______ my breath often.
【单选题】山莨菪碱抗感染性休克主要是因为它能
A.
兴奋心脏,增加心输出量
B.
解除迷走神经对心脏的抑制
C.
扩张血管,改善微循环
D.
收缩血管,升高血压
E.
松弛支气管平滑肌,解除呼吸困难
【简答题】I like volleyball and I have a volleyball. I often take it to school and play it with my friends. It’s fun. — Sally Sports are good for me. I like sports. I’m in the school sports club. I often ...
【简答题】I often help my mother _____ housework. [ ] A does B did C do
【单选题】I told my friend Graham that I often cycle the two miles from my house to the town centre but un fortunately there is a big hill on the route. He replied, 'You mean fortunately.' He explained that I s...
A.
extra
B.
excess
C.
surplus
D.
spare
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