Miss Gao is our teacher. We all like ____ (she).
如图,AB⊥BC,AD⊥CD,垂足分别为B、D,若CB=CD,则△ABC≌△ACD,理由是( )
我国山区面积广大的优势是( )
①水银②活性炭③生石灰④二氧化硫⑤碳酸钙⑥氢气