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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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# \* C$ t9 n8 C, i, e' U$ Z以上文字摘录自:CSA C22.2 No.250.13-12,如图:
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3 G* r3 y9 ]: h/ v欢迎探讨标准细微之处!1 `( R& u. t6 B8 y5 f
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