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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.
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+ r6 d/ {8 p7 J% n以上文字摘录自:CSA C22.2 No.250.13-12,如图:/ ^. Y& A- } p. H d% @
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