(?) (?)动(Dong)力(Li)箱(Xiang)通(Tong)常(Chang)采(Cai)用(Yong)型(Xing)号(Hao)XL-21,(?)动(Dong)力(Li)箱(Xiang)涉(She)及(Ji)的(De)类(Lei)型(Xing)很(Hen)多(Duo),(?)如(Ru)用(Yong)于(Yu)消(Xiao)防(Fang)电(Dian)梯(Ti)、(?)客(Ke)梯(Ti)、(?)风(Feng)机(Ji)水(Shui)泵(Beng)控(Kong)制(Zhi)箱(Xiang);