对调查资料的统计与分析,就是从()入手研究电信市场的现状及其发展。
A、需求方面C
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Weneedfriendsto________,orwewillfeellonely.
I'msorryI'veforgottentopostyourletter.
—Nevermind._____postitmyself.
Forsomereason,it__________alldayoverthetwoweeks.
I______goingforawalkaftersupper.Doyouwanttogotogetherwithme?
设A为5阶方阵,且r(A)=3,则线性空间W={x|Ax=0}的维数是______________.