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7 g. z5 m9 `' S1 Ashall 应 指满足本规范必须遵从的强制性要求
: F3 {% b) U9 z3 `1 `6 @4 Eshould 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) Q+ `5 C& F& Q" O8 z% ?3 x
在否定证据当中不赞成某个措施但也不禁止& ~6 G* F- D/ ?, ?& N" X+ K) ]; v
建议看一下:' Y7 S: v; a9 `6 [+ B- N+ E
http://bbs.angui.org/forum.php?m ... ghlight=shall%2Bmay
8 R* a; {, A* r5 U/ D1 K8 \8 P' D% f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 q! D0 P9 ~% d0 K& E3 V0 N( K
6 F- A( y" D& g* v* Psingle-core cable: no preferred colour scheme;
- X5 Y- @2 E8 Ltwo-core cable: no preferred colour scheme;4 q2 F- ?: u" q. T" o
three-core cable: either green-and-yellow, blue, brown,9 q/ ~$ m/ T3 Z: b* S
or brown, black, grey$ J4 _9 j; m% l& i
four-core cable: either green-and-yellow, brown, black, grey,
) `3 F( L5 e$ | C. S4 i% dor blue, brown, black, grey& u& z9 r/ X: C3 P0 E. W
five-core cable: either green-and-yellow, blue, brown, black, grey,
' b; l$ E/ ~1 W* aor blue, brown, black, grey, black.: g+ b" o# ^8 X) h9 k% I2 |* p; [
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