单词	periodic selection
释义	periodic selection 周期选择作用
随便看	adjustable heater valve adjustable heat pump Adjustable heel strap.Quickfit? lacing system adjustable height adjustable-height Adjustable height of separation plate adjustable hitch bar adjustable hitch for vehicle adjustable hollow cutter adjustable hollow mill adjustable hook rule adjustable hook spanner adjustable hook wrench with nose Adjustable Hook Wrench with Pin adjustable horizontal bar adjustable horizontal stabilizer adjustable hose line foam nozzle adjustable housing adjustable housings adjustable hub liner adjustable hydraulic coupler adjustable ID gauge adjustable illuminance adjustable illumination adjustable impedance type ballast