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1 K2 W/ y. Z# y7 @- k" w1 wshall 应 指满足本规范必须遵从的强制性要求% l0 `, u2 k" W% ?
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
F: m. P* m# ]; U w在否定证据当中不赞成某个措施但也不禁止: I0 l: U& ~; Q. u; g. t' ^
建议看一下:
5 p; m2 K. _, i" e3 s! P8 zhttp://bbs.angui.org/forum.php?m ... ghlight=shall%2Bmay" I7 K, _ F0 w% ^& V; \
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/ p" y+ u9 b( `) j5 k7 L5 N' H
- q% M1 \6 y# J9 `& d; nsingle-core cable: no preferred colour scheme;
6 P' E2 I6 u# f3 r" p6 O* W1 itwo-core cable: no preferred colour scheme;
9 _% N3 j& S! b+ wthree-core cable: either green-and-yellow, blue, brown,: t; v& Y2 k6 s/ W" _
or brown, black, grey# x( M# @7 [% x. e+ a# S! l
four-core cable: either green-and-yellow, brown, black, grey,
0 U- q1 d& L$ |' bor blue, brown, black, grey
6 Z; o: ~) k8 ~) dfive-core cable: either green-and-yellow, blue, brown, black, grey, {% z+ z5 H4 Z) U
or blue, brown, black, grey, black.
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