Returns to scale changes must change with proportion to input, however, the economies of scale only requires the relation among the enlargement of the comparative scale and unit cost.
The excellent development of coal - rich regularity in recent decades includes mainly coal - bearing model, coal -rich belt and coal - rich unit, comparative sedimentology of modern peat and swamp.
富煤规律研究的突出进展主要包括聚煤模式、富煤带和富煤单元以及现代泥炭比较沉积学研究。
3
Being part of the sense group, the translation unit is semantically equivalent and structurally comparative to the smallest unit in the source text.