跨距: span; spread; spacing; strid ...跨距中心: centre of span组距中点: class index; class mark肋骨间距中点: midbay跨距: [工业] span; spread; spacing; strided distance; track◇跨距长度 length of span; 跨距中心 centre of span中点: center mark; center point; centre mark; centre middle; centre point; centre spot; focus; median point; mid point; mid position; mid-position; middle point; neutral point长跨距: long span净跨距: clear span跨距；跨度: span跨距点: ski oint; skipoint; span point跨距法: set-over method梁跨距: beam span列跨距: column span行跨距: row span中跨距: central span中跨距(中心跨距): central span组中点；区中点: cla mid-point（cla mark）; class mid-point (class mark); class mid-point （class mark）组中点；组中点: cla mark（cla mid-point）; class mark (class mid-point); class mark （class mid-point）测距中误差: mean square error of distance measurement档距中间: mid span短源距中子: ssn均距中心: center of mean distance视距中星仪: tachymeter-tra it; tachymeter-transit准距中心: centre of anallatism组距中值: class mid value; class midvaluee
