【单选题】若x>0,y>0,M>0,a>0,且a≠1,已知下列运算: 1 (xy)= x· y; 2 (x-y)= ; 3 = x- y; 4 ( )=n M.其中正确的个数有
【单选题】The editor has ______ the book with black-and-white photographs.
【单选题】The government will speed up the pace of shifting the focus of its pro-active fiscal policy from ( ) economic growth to sustainable development.政府将加快转变步伐,将积极的财政政策的重点由刺激经济增长转变为寻求可持续发展。
【简答题】pro-innovation government
【简答题】The editor has ____________ the book with black-and-white photographs.
【单选题】The best title for the passage might be
A.
Copyright, to Be Protected Urgently.
B.
The Pro-copyrightholder Verdict, a True Victory?
C.
Piracy out of Control.
D.
Tech Firms, How Far to Go?
【单选题】若-4x 2 y和-23x m y n 是同类项,则m,n的值分别是( )
【简答题】设X 1 ,X 2 ,X 3 ,X 4 是来自正态总体X~N(0,2 2 )的样本,令 Y=a(X 1 -2X 2 ) 2 +6(3X 3 -4X 4 ) 2 , 若统计量Y服从χ 2 分布,试确定a,b的值及χ 2 分布的自由度γ
【单选题】议付行对信用证受益人的单据和汇票进行议付,这种行为( )。
【单选题】The editor has _____the book with black-and-white photographs.