A:I want to go to school.
B:I want to go on a trip.
Jack is an intelligent pupil, but he lacks m____ (主动性).
下列各变化属于物理变化的是()
计算1110(2)+1010(2)+100001(2)÷1011(2).
将下列选项中的平面图形绕直线l旋转一周,可得到如图所示立体图形( )