RECPTabbr.收到；收据(=receipt)RECabbr.录制（=record)receiving paraboloid抛物面接收天线reciprocating column往复式塔reciprocity constant互易常数reconciling database协调数据库recombination repair重组修复rectilinear drainage直线形排水系统recalcification time复钙时间, 再钙化时间rectification factor整流因数recombination signalRSRecamier's operation