class D丁类classn.等级；阶级；阶层；班级；课；[生]纲；<口>出色的风度v.分类class of subscriber用户类别Class of saturation饱和类classified analysis聚类分析class decomposition阶级分解classified railings分级尾砂class A signal area强电视信号区class-c operation[电] C类操作class of insulation绝缘等级class encouragement课堂激励class interval size组距