外表长得一样,但里面不一样 * ^8 d! H: W B# w, Z! v' x9 B$ S- w" `( J. u G
one stage T-STAT has "w" wire terminal + v) w( y2 J" h+ t, ytwo stage T-STAT has "w1" and "w2" wire terminal7 [& |) {) F' A3 ?* _) T& S
3 O) `# U5 _( D' w$ ^+ n" ~' H; f4 }) l+ _$ c
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