|
2 V, y7 b; i/ O2 t
shall 应 指满足本规范必须遵从的强制性要求& U3 ~* [" h6 Q6 Z( w5 {
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
% h3 Z9 @( g' V4 `+ i& j在否定证据当中不赞成某个措施但也不禁止
, A; H$ X; ~( G5 J8 [5 O/ e4 ^建议看一下:
9 D$ w# ~, _6 k: Qhttp://bbs.angui.org/forum.php?m ... ghlight=shall%2Bmay
: n4 Q( E! A5 x4 z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
+ h* y( s) u2 o, j) N
3 {5 ^) O. c a) g9 u) G% Qsingle-core cable: no preferred colour scheme;3 @2 p$ Y6 @' L9 J4 T1 w
two-core cable: no preferred colour scheme;
) n/ ~& v2 R$ I/ tthree-core cable: either green-and-yellow, blue, brown,# e% ~1 [- H! ]: E# `
or brown, black, grey
$ K! z2 v) x6 g2 X& c# `+ kfour-core cable: either green-and-yellow, brown, black, grey,, A( h4 ` Z( F- w
or blue, brown, black, grey" ]. D+ X- a4 w. t. m9 P' g
five-core cable: either green-and-yellow, blue, brown, black, grey,
8 f3 \# N2 V+ e& a; Nor blue, brown, black, grey, black.) p0 D$ c8 f6 L' H( `
|
|