A low-cost low-temperature sand control agent has been developed by optimizing the structure of phenolic resin and synthesizing low-cost resin with coal tar and paraformaldehyde.是什么意思_A low-cost low-temperature sand control agent has been developed by optimizing the structure of phenolic resin and synthesizing low-cost resin with coal tar and paraformaldehyde.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句