they also shall be constructed so that the indicator cannot be misassembled & Y) M! @4 j" _* u, _
to give an incorrect indication as to whether the valve is open or closed * J' r2 |) G* x从后面incorrect 看出是错装
原帖由 睿智 于 2007-12-8 19:10 发表 + v4 W! s9 I3 C+ i/ U1 n
they also shall be constructed so that the indicator cannot be misassembled & a: O6 m3 n9 k0 U$ ^0 C4 u
to give an incorrect indication as to whether the valve is open or closed / M/ D0 J& Q. H) n1 A从后面incorrect 看出是错装