The use of standard gray scale and color targets in the scene is required for correct camera exposure and positive printing . 在景物中设置标准灰阶标板和彩色靶标，其目的是为了确定正确的曝光量和正片印制。
阶: steps; stairs标: Rockwell A scale板: board; plank; plate标板: scale; target目标板: target board二阶标架: frame of order two一阶标架族: family of frames of order one标板反差: target-object contrast闪灯标板: flash sign board商标板垫环: gasket name plate视觉标板: visual controlled oscillator双线标板: paired-line target套盖商标板: name plate head cover节目提示标板: chain break对线分测板，双线标板: paired-line target商标板夹金螺栓: bolts name plate检查平台式缩微摄影机系统性能用的测试标板: micrographics-planetary camera systems-test target for checking performance平台式缩微摄影机用测试标板的特征及其使用: micrographics test object character and instruction for 16mm microfilm recorderr缩微摄影时检验负像光学密度用测试标板: micrographics-test target of optical density measurement for microfilming negative阶不变量: invariant of order p p阶比: order ratio阶部分: exponent part阶（群论）: order阶层: (social) stratum; rank; section 各阶级各阶层的人 people of all ranks and classes; 社会阶层 social stratum; 特权阶层 the privileged stratum; 中间阶层 intermediate stratum阶: 名词1.(台阶) steps; stairs 石阶 stone stairs; 台阶 a flight of steps2.(等级) rank 军阶 military rank3.[医学] (耳蜗的三个螺旋管的任一个) scala 中阶 scala media4.[数学] order 非整数阶 non-integral order; 矩阵的阶 order of a matrix5.[地质学] stage 瓦伦特阶 valentian stage; 韦尔芬阶 werfenian stage阶层表达，阶层关系: nesting
