词汇	steel base frame
释义	steel base frame 钢制底座
随便看	operational-control information operational control key Operational Control Level operational controlopc Operational Control Program Operational Control Room operational controls Operational Control Segment operational control system operational control unit Operational Control Van Operational Control Work Post operational coordination operational correction operationalcost operational cost operation al cost operational cost control operational cost management operational cost method operational costs operational counter operational courses operational coverage diagram operational creativity