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1.一煤块由静止放到水平向右匀速运动的白色传送带上,煤块在传送带上划出一段黑色的痕迹,若以传送带为参考系,则煤块在传送带上划痕的过程可描述为()A.向右做匀加速运动B.向右做匀减速运动C.向左做匀减速运动D.向左做匀加速运动2.图1为一物体沿南北方向(规定向北为正方
1. A piece of coal is placed on a white conveyor belt that is still moving horizontally and horizontally to a right. The coal block marks a black trace on the conveyor belt. If the conveyor belt is used as a reference system, the coal block can be scratched on the conveyor belt () A. Right to do uniform acceleration B. Right to do uniform deceleration C. Left to do uniform deceleration D. Left to do uniform acceleration 2. Figure 1 is an object along the north-south direction (the provisions of the north Square