下图表示了室温时某气体分子按速率的分布，υ[img=5x18]1803df1c1225a36.jpg[/img]为室温时气体分子的最可几速率，而[img=9x11]1803df1c1b11e87.jpg[/img][img=5x18]1803df1c239d007.jpg[/img]表示在速率υ[img=5x18]1803df1c239d007.jpg[/img]附近单位速率区间内的气体分子数，若该气体的温度降低，则[img=16x16]1803df1c34c141f.jpg[/img]和υ[img=5x18]1803df1c239d007.jpg[/img]将如何变化( )。[img=388x285]1803df1c47164c6.jpg[/img] A: υ[img=5x18]1803df1c50659d1.jpg[/img]变小而[img=9x11]1803df1c58c4df6.jpg[/img][img=5x18]1803df1c50659d1.jpg[/img]保持不变 B: υ[img=5x18]1803df1c50659d1.jpg[/img]和[img=9x11]1803df1c58c4df6.jpg[/img][img=5x18]1803df1c50659d1.jpg[/img]均变小 C: υ[img=5x18]1803df1c50659d1.jpg[/img]变小而[img=9x11]1803df1c58c4df6.jpg[/img][img=5x18]1803df1c50659d1.jpg[/img]变大 D: υ[img=5x18]1803df1c50659d1.jpg[/img]保持不变而[img=9x11]1803df1c58c4df6.jpg[/img][img=5x18]1803df1c50659d1.jpg[/img]变大