外表长得一样,但里面不一样* z: {( e9 ?) f. L+ t9 |: e- e; C
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one stage T-STAT has "w" wire terminal ( `) {/ J: Z+ Wtwo stage T-STAT has "w1" and "w2" wire terminal " \' e. U8 P% ]; v! H# V' j- S/ O4 v
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