SLDn.双倍左移(图纸的装箱单日；拉门；减速；螺线管)SLabbr.透镜分光计(=lens spectrometer)abbr.海平面(=sea level)sliding rail screw滑道撑紧螺钉sliding scale plan可变分配率制度sliding dog clutch滑动爪形离合器sliding head stock滑动床头箱sliding structures滑移隔震结构sliding scale duty[经] 滑动税率sliding plate ring垫圈sliding micrometer滑动测微计sliding-bat kiln滑板窑, 滑底隧道窑sliding door track推拉门滑轨