按照物质对人类的可用性，物质人为流动可分为（）类型

A.发生的地表圈层不同 They occur in different earth spheres

B.流动驱动力不同 They are driven by different forces

C.服务目标不同 They have different service purposes

D.以上三种 The above three items

A.恒定流

B.均匀流

C.非均匀流

D.一元流

E.二元流

A.动流体内的压力

B.流动流体内的流速

C.管道内流体流动的流量

D.管道内不同两点处流动流体的压力差

A.人类用量保持不变的物质 The material whose uses by human beings remains constant

B.人类用量增长较慢的物质 The material that has a slower increase in human consumption

C.人类用量增长较快的物质 The material that had a rapid increase in human consumption

D.以上都不对 None of the above