如图所示,在不计滑轮摩擦和绳子质量的条件下,当小车匀速向右运动时,物体A的受力情况是绳的拉力____A的重力.(填大于、等于或小于)
建筑工地上的起重机把一框砖先竖直向上提升40m,然后水平移动30m,此过程中砖块的路程和位移大小( )
已知2x2+3y2+6z2=a,x+y+z=a﹣2,则实数a的取值范围是____
如图为电路元件A和B的I一U图象,根据图象提供的信息,求:
My brother usually _____ in a townhouse with us. But now he _____ for an apartment near the school.