皮皮学,免费搜题
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搜题
【单选题】
设A,B是n阶对称矩阵,且A与B合同,则下列命题错误的是:
A.
A与B秩相等
B.
任意n阶可逆矩阵C,B与 合同
C.
A与B等价
D.
A,B的行列式相等
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【简答题】在资料区里下载“第7章 机件的基本表达法-习题.ppt”,在作业纸上完成相应题,并拍照提交。
【单选题】设定义在实数集上的函数f(x)对任意x∈R均有f(x)+f(2-x)=1,则这个函数的图象必关于(   )
A.
直线x=1对称
B.
点(1,1)对称
C.
点(1, )对称
D.
点(2,1)对称
【判断题】示教器复位按钮可以解决示教器死机或者示教器本身硬件引起的其他异常情况。
A.
正确
B.
错误
【简答题】设f(x)是定义在R上的奇函数,且对任意实数x,恒有f(x+1)=f(1-x).当x∈[0,2]时,f(x)=2x-x 2 . (1)求证:f(x)是周期函数; (2)当x∈[2,4]时,求f(x)的解析式; (3)f(1)+f(2)+f(3)+…+f(2013).
【单选题】According to the text, which of the following is not necessarily true?
A.
Excluding game theory, economics is a short-sighted science.
B.
Game theory is only properly applied when future decisions are considered.
C.
Maximization is a goal that can only be achieved in the long-term.
D.
Game theory leads managers to make correct decisions with the application of economics.
【单选题】设f(x)是定义在R上的函数,且对任意实数x,恒有f(x+2)=-3f(x).当x∈[0,2]时,f(x)=2x-x 2 .则f(0)+f(-1)+f(-1)+…+f(-2014)=(  )
A.
- 3 4 (1-3 1007 )
B.
- 3 4 (1+3 1007 )
C.
- 1 4 (1- 1 3 1007 )
D.
- 1 4 (1+ 1 3 1007 )
【多选题】教学活动就其本质而言,是一种特殊的认识活动,是因为( )。
A.
教学认知过程是一种学生的认识过程
B.
教学认识过程是一种间接性的认识过程
C.
教学认识过程是一种在教师领导下的认识过程
D.
教学认识过程是一种有教育性的认识过程
【单选题】I Read the text and put the topic sentences on the blanks to complete the text. 3 Social media is not the only technology that changes our opinions of ourselves.
A.
B.
C.
C
【单选题】According to the text, which of the following is NOT true?
A.
American food only includes hamburgers, hotdogs and pizzas.
B.
Chicago is known for thick crust and stuffed pizzas.
C.
When you are not happy, eat the delicious food and everything is gone.
D.
When you share the food with others, you will fi nd happiness is so simple.
【简答题】Directions:Read the following statements and mark Y (for Yes) if the statement agrees with the information given in the text; N (for No) if the statement contradicts the information given in the text;...
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