【单选题】按连续介质概念,流体质点是指
D.
微观上由大量分子组成,宏观上只占据一个空间点的流体
【单选题】按连续介质概念,流体质点是指
D.
几何尺寸同流动空间相比是极小量,又含有大量分子的微元体
【单选题】______ is one of the popular activities for the first two days of the Water Splashing Festival?
A.
Chanting Buddhist scripture
【多选题】控制的每一个过程都要经过( )等基本步骤
【单选题】Students can learn about of music by speaking, chanting, singing, dancing, acting and playing instrument.
【单选题】圆管液体层流,实测管轴线上的流速为4m/s。则断面平均流速为()