selectivelyadv.有选择地selectiveadj.选择的；选择性的；精挑细选的selective jettison选择投弃selective purposes选择性目的selective gradient选择梯度selective emission选择放射selective radiation选择辐射selective incentive选择性激励selective herbicide选择性除草剂selective headstock变速箱,床头箱selective enriching选择性富集selective gearshift选择式换挡机构