①合理合法性 ②公共受益性 ③公平补偿性 ④公开参与性
A:①②③
B:②③④
C:①②④
D:①②③④
已知函数fx=x2+2x-3集合M=x,y|fx+fy≤0N=x,y|fx-fy>0,则M∩N的面积是( )
The Belt and Road Initiative(一带一路倡议)will help China improve with those related countries, especially Pakistan.