组: group距: distance组距中值: class mid value; class midvaluee跨距中点: centre of span; mid span; midspan; span centre肋骨间距中点: midbay组距: calss interval; class interval; class inteval; class width; grouinterval; grouping interval; step interval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组距值: class value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)不等组距: unequal class intervals价格组距: price interval检波组距: geophone distance可靠的组距: reliable interval limit可信的组距: fiducial interval limit相等组距: equal interval相等缈组距: equal interval中数组距: median interval组距大小: magnitude of class interval组距数值: value of class interval组区间;组距: cla interval; class interval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