三个常见情态动词在标准规范中的含义? Shall Is to be understood as mandatory. Deviating from a “ shall ” statement usually requires derogation approved by the client. Should Is to be understood as strongly recommended to comply with the requirements of the specification. Alternatives shall provide a similar level of requirements and this shall be documented. May Is used where alternatives are equally acceptable.查看更多1个回答 . 1人已关注