外表长得一样,但里面不一样 / a2 y" m' t$ y X8 I [' r$ w; s: Z L* u
one stage T-STAT has "w" wire terminal/ l; z2 L1 |! k+ a- a5 u
two stage T-STAT has "w1" and "w2" wire terminal 4 q1 {. y4 ]* b 3 h1 W. ]3 A5 t4 H3 V Y" [. D) E6 M! u9 Y
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