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shall 应 指满足本规范必须遵从的强制性要求. c Q% o- p+ o) r
should 应该 指在多个可能性当中,认为特别合适,但不排斥其它的可能性.或是优选一套措施,但不是要求.或是
! h1 G" n |+ U, |( U在否定证据当中不赞成某个措施但也不禁止& B/ c% e8 w( Q1 Z
建议看一下:
; T L, l1 j; G* t# ahttp://bbs.angui.org/forum.php?m ... ghlight=shall%2Bmay& a3 o; f5 B" Z0 e5 A ^. r) s
如果可以用别的颜色作为地线,那么,不排除让写标准的人承认,“棕、蓝”都可以用来作地线! o4 z6 n v& V0 V
# h3 V. z9 I5 y& E) ^single-core cable: no preferred colour scheme;) i3 ?0 q' C6 C$ T' `+ R
two-core cable: no preferred colour scheme;4 ]' L/ S+ x: P! U' s- C
three-core cable: either green-and-yellow, blue, brown,
; A: F/ o: d: u3 R* Vor brown, black, grey
( V: |$ i. `. B+ Q4 Nfour-core cable: either green-and-yellow, brown, black, grey," Z) ^' a' y" \: p# ~3 u, Z% _
or blue, brown, black, grey+ ^" ~, ?/ b" R
five-core cable: either green-and-yellow, blue, brown, black, grey,
- z: L: ^' A% x0 Bor blue, brown, black, grey, black. D$ _' i, i( N* l
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