protective gap保护放电器,保险隙protectiveadj.保护的；防卫的protective legislation[法] 保护贸易立法protective thunderbolt防雷Protective inport duty保护性进口税protective work helmet安全帽protective development保护性开发protective mooring rod防护锚杆protective legislating[经] 保护法令protective institution保护机构protective insecticide胃毒剂protective export duty保护性出口税