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In CSA standards, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the standard.3 U' i' k V- k8 {- P( `
4 o& L7 w. q/ k3 T- D4 l! v7 q: K以上文字摘录自:CSA C22.2 No.250.13-12,如图:
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欢迎探讨标准细微之处!$ y- i3 W% n4 q' g9 x
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