system of bars
科技
synthetic hydraulic fluid
swing tray elevator
swept back wing
sweep back angle
suspended tray elevator
surface tension effect
surface standing wave
surface shear wave
surface seismic wave
surface run off
surface of discontinuity
surface of contact
surface heat exchanger
surface friction coefficient
surface diffusion coefficient
supersonic wind tunnel
supersonic flaw detector
superficial internal energy
sugar cane harvester
submerged arc welding
sub zero treatment
structure sensitive property
structure insensitive property
stroke of piston
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