A:(-∞,32
B:-∞,32
C:32,+∞)
D:32,+∞
当a=﹣12,b=4时,多项式2a2b﹣3a﹣3a2b+2a的值为( )
食用鱼、鸡蛋、瘦肉等食品,主要是为人体补充 ( )
许多成语典故来源于历史,如退避三舍、卧薪尝胆、围魏救赵、纸上谈兵等。这些成语反映出春秋战国时期的哪一特点?( )
⑴____ A. make B. late C. map D. male
⑵____ A. famous B. found C. shout D. ground
⑶____ A. worked B. called C. stayed D. lived
⑷____ A.mouth B.round C.group D.ground
⑸____ A.days B.bags C.pens D.maps
已知a>0,b<0,那么点P(a,b)在( )