A standard quantity used for measurements such as length, area, and height.

一个标准的量用于没有如长度、区域和高度。

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The main reason is there is big gap in pesticide standard quantity between EU and China.

笔者认为，这是由于中国和欧盟国家之间农残标准数量相差太大引起的。

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The results of the sample for the test have shown that the quantity of fatty substance in milk is appropriate to the standard.

采样检验的结果表明牛奶中的脂肪含量达标。

《新英汉大辞典》

In this context it refers to the card that is sent to reorder a standard quantity of parts as and when they have been used up in the manufacturing process.

ECONOMIST: Idea

Under a true gold standard, the optimal quantity of money is determined by market forces the money supply spontaneously adjusts to the demand for money, and long-run price stability is achieved.

FORBES: The Federal Reserve's Flawed Approach To Monetary Policy

Unlike the classical gold standard, there is no market feedback mechanism to bring the quantity of money in line with the demand for money while maintaining long-run price stability.

FORBES: The Limits Of Monetary Policy Call For Moral, Sound Money