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有哪位高手解释一下3段内容的意思：
' X% q, K+ Z' b0 v The start and finish of text introduced or altered by amendment is
/ _1 {" b) z: J2 F1 Z9 d3 [9 aindicated in the text by tags. Tags indicating changes to IEC text carry+ @+ S- u$ G5 Y% M. l& s! e3 m/ C
the number of the IEC amendment. For example, text altered by IEC5 D& C8 v2 B e) ^
amendment 1 is indicated by (A1-A1)% T& K& P( n3 [7 @2 R. I( ~4 A
( R# h; d" H* n" i
The CENELEC common modifications have been implemented at the
" u5 f: P$ q# h+ y& M. j9 \appropriate places in the text. The start and finish of each common$ j+ }7 `( l+ P1 N3 ?( {
modification is indicated in the text by tags (C-C). Where a common
# l* R/ y |3 ~- Lmodification has been introduced by CENELEC amendment, the tags" r0 D4 S1 x2 A0 h; O
carry the number of the amendment. For example, the common
. V8 p. @+ O" i1 E6 `( G' O/ g8 I. kmodifications introduced by CENELEC amendment A11 are indicated4 F' M0 ]7 ~$ }0 L" I
by (C11-C11): x7 U/ U+ j' e, u1 T
% L) s% [# k2 f: i
9 g7 P+ l) J* y1 p8 w7 `The start and finish of text introduced or altered by corrigendum is1 z! V, p; m+ _6 q/ ]) z* i* J2 \; a
indicated in the text by tags. Text altered by CENELEC corrigendum% d8 Z& C# D* m7 b
July 2009 is indicated in the text by (AC1-AC1)
/ ]1 d( q$ ~' j2 m$ H" h5 ?, k
0 N9 d% e/ [9 O |
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