1+3=2×2
1+3+5=3×3
1+3+5+7= 4×4
1+3+5+7+( )+( )=6×6
1+3+5+7+……+14+19=( )×( )
9;11;10;10
Sally's never seen a play in the Shanghai Grand Theatre, ________?[ ]
A. hasn't she
B. has she
C. isn't she
D. is she
在众多激励理论中进一步改进了马斯洛需要层次理论并提出“挫折—退化”观点的是( )。
A.目标设置理论
B.公平理论
C.三重需要理论
D.ERG理论