描述液体运动有迹线和流线的概念:()。
A.流线上质点不沿迹线运动
B.质点运动的轨迹称为流线
C.流线上质点的流速矢量与流线相切
D.质点的迹线和流线都重合
参考答案:C
解析:
----Is that the small town you often refer to?
----Right, just the one ______ you know I used to work for years.
A.which
B.where
C.that
D.what
进料热状况对精馏操作没有影响。