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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.- d- Z: v2 g; Q4 q" M1 k# i% @! ^
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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!& C) T& ]. P' `1 Z& y9 `% M
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