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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.0 {& [: e8 t% r7 `5 H! e9 X' @
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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' `4 t1 u, g+ H9 g0 a* I
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