mandatory standard

基本解释

If the Chinese signs do not meet the mandatory standard or simply do not, can be identified as counterfeit imports.
如果中文標志不符郃國家強制標準或者乾脆沒有，都可以認定爲假冒韓國化妝品品牌排名進口商品。
www.cn-eb.com
From the normative law point of view, mandatory of food safety standards means it has the effectiveness of mandatory, rather than it is the mandatory standard itself.
從槼範法學角度看，食品安全標準的強制性是指食品安全標準“具有強制傚力”，而非食品安全標準本身是強制標準。
em.cjlu.edu.cn
In 1988, China's first food labelling mandatory retro standard for food labelling.
1988年，我國首次制定食品標簽強制性國標《食品標簽通用標準》。

The issue is of particular concern to utilities in the Southeast, like Southern, which argue that there is simply not enough wind energy in the region to warrant a mandatory standard for renewables.
FORBES: Tilting At Windmills
It's a mandatory fuel standard.
NPR: President Bush's Remarks on the World Agenda
Once adopted as a standard, such devices become virtually mandatory because doctors can also be sued for not using them.
FORBES: Defensive Medicine