Transforming tar sands into crude is costly as well as dirty: the process only becomes profitable with oil prices in the $60-85 range or higher.
把焦油沙转换成原油不仅费用昂贵而且对环境造成污染。当油价在60-85美元范围波动或允许再高一点,这种提炼过程才有利可图。
The labor range that female worker contraindication undertakes includes : ( 1 ) course of study of mine well dirty ;
女职工禁忌从事的劳动范围包括： （1 ）矿山井下作业； （ 2 ）森林业伐木、归楞及流放作业；
The labor range that female worker contraindication undertakes includes : ( 1 ) course of study of mine well dirty ;
女职工禁忌从事的劳动范围包括： （1 ）矿山井下作业； （ 2 ）森林业伐木、归楞及流放作业；
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