词汇	selective headstock
释义	selective headstock 变速箱,床头箱
随便看	Bi-direction bi-step bidirection chain bidirection communication bi-direction communication bi-direction DC/DC circuit bidirection diode bi-direction diode bidirection expression vector bi-direction jet current bi-direction multi-lateral bi-direction power flow bidirection printer Bi-direction pump bidirection reasoning bidirection remote control bidirection restraints bi-direction scheduling bidirection shift technique bidirection superior cavopulmonary anastomosis bi-direction switch bi-direction transceiver bi-direction transmission bidirection triggering Bi-direction valve bi-direction variable-tension control