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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.$ R+ `! ~) j% W1 X$ w
! @0 |6 A; b& N, B以上文字摘录自:CSA C22.2 No.250.13-12,如图:. ^, H+ g/ d2 D7 D' M# G
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