简答题 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.

问答题翻译：As is well known gas mixture do not follow the simple gad laws but deviate from them when place under pressure.

问答题翻译：As more and more ethane and propane are extracted form natural gas, the control of the But or heating content of gas becomes mere important.

问答题翻译：In other countries products pipelines may move refined products from coustal refinery or tanker unloading terminals to the interior of the country to supply populated areas.

问答题翻译：Products pipeline can often carry serveral different products in the same pipeline.