单项选择题
A.23±3℃ B.30±3℃ C.28±3℃ D.32±3℃
A.a->b->d->c B.b->a->c->d C.d->a->b->c D.a->d->b->c
A.12*6mm B.1.2*0.6Inch C.0.12*0.06Inch D.0.12*0.6Inch
A.PCBB.PCBAC.PCAD.以上都不对
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