A. It's very hot.
B. Three little pigs are fat.
C.I have a good idea.
D. Open the door.
E. We are good brothers.
已知函数y=sinwx+π3w>0在π4,π2上单调递减,则w的取值范围( )
目前,影响我国可持续发展的最大障碍是 ( )