Petroleum engineers plan and manage the extraction of oil.石油工程师规划并管理石油的提炼。The purpose of oil refinery is to refine crude petroleum.炼油厂的主要工作是提炼原油.They refined crude oil into various petroleum products.他们将原油提炼成各种石油产品....
They refined crude oil into various petroleum products.他们将原油提炼成各种石油产品.ABout 90 % of the waxes in commerce are recovered by dewaxing petroleum.工业用蜡中约有90%是由石油中回收的.The petroleum exploration geologist working with subsurface...
His coat was a somber brown.他的衣服是暗棕色的.He had a somber expression on his face.他面容忧郁.She was dressed in somber black.她穿一身灰黑色衣服.He was a post - impressionist painter whose early works somber, dark colors.他的早期作品说明他是一名后印象派画家....
A polygon with ten sides is a decagon.十条边的形状叫十边形。The frequency polygon is simpler than its histogram counterpart.频率多边形比直方图更简单.What is the perimeter of this polygon?这个多边形的周长是多少?...