外表长得一样,但里面不一样 + W' A/ A( |7 S ~* v9 T3 q! F- J6 _# Q; O) o+ J# c
one stage T-STAT has "w" wire terminal! C9 W" f- Z6 q4 |" A
two stage T-STAT has "w1" and "w2" wire terminal9 u' S9 Z. U& O) H- Z. N
0 x% p& W( {' c1 N3 M4 d8 l0 z0 [: J( y" a6 @' y% x
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