某地位于140°W,与它组成经线圈的经线是( )
A:40°E
B:140°E
C:60°E
D:40°W
一物体作匀变速直线运动,速度图象如图所示,则在前4s内(设向右为正方向)( )
—Yes.He needs to eat more food.
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