The flowing state in narrow annuli changes apparently quicker than that in circular tube.窄环隙流道内流态由层流向紊流转变明显提前.The velocity profile should be confirmed when non - Newtonian fluid flowing in duct and annuli is researched.在...
经济部长宣布了对石油销售的限制。The economic affairs minister announced limits on petrol sales.国内销售的停滞不前正阻碍着经济复苏。Stagnation in home sales is holding back economic recovery.销售的速度慢了下来。Sales are slowing up....