问答题 翻译：No attempt will be made to derive the formula or compare it with other flow formula, as so many excellent papers have been written on this subject.

问答题 翻译：This method is based on the difference in propagation velocity of artificially induced elastic waves through various subsurface strata.

问答题 翻译：Multiphase flow may be categorized into four different flow configurations or flow regimes consisting of bubble flow ,slug flow ,slug mist transition flow and mist flow.