Tail margin: White space below the text area of a page. Also called Foot margin.
脚白边:书页内,在版芯下边的空白部分,亦称地脚。
Head margin: the margin at the top of a page.
头白边:书页上边的空白部份。
The margin income and margin cost of technology element are zero;
高科技企业科技要素投入的边际递增性和边际成本趋于零;
The margin income and margin cost of technology element are zero;
高科技企业科技要素投入的边际递增性和边际成本趋于零;
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