粒子沉降过程分           阶段和            阶段。

A、<span style="font-size:14px;font-family:&#39;微软雅黑&#39;,&#39;sans-serif&#39;;color:#222222">加速和减速</span>

B、<span style="font-size:14px;font-family:宋体;color:#222222">加速和匀速</span>

C、<span style="font-size:14px;font-family:&#39;微软雅黑&#39;,&#39;sans-serif&#39;;color:#222222">减速和匀速</span>

D、<span style="font-size:14px;font-family:&#39;微软雅黑&#39;,&#39;sans-serif&#39;;color:#222222">匀速和减速</span>