如果点A(x-2,2y+4)在第二象限,那么x的取值范围是( ),y的取值范围是( )。
x<2;y>-2
It took us quite a long time to get to the amusement park. It was journey.
A.three hour
B.a three-hours
C.a three-hour
D.three hours
钢铁材料磨削时产生的火花()一般能显示钢的含碳量多少。
A、根部火花
B、尾部火花
C、中部火花
D、火束