the source principle 源头原则
imaginary source principle 虚震源原理
principle of taxation at source [税收] 来源原则
source principle 来源地课税
taxation at source principle 由收入来源征税的原则
In the Mesozoic petroleum system in Yanqi basin, the Badaowan Formation is the principle source rock with coal-measure mudstone as the main type of source rock.
焉耆盆地中生界含油气系统中，八道湾组是最主要的烃源岩层，烃源岩类型主要为煤系泥岩。
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