Gradenn.格拉登（音译名）graden.等级；年级；成绩；斜坡v.分级；评分；渐次变化graded preference relay接地选择继电器grade of gypsum product石膏产品品位graded density impactor密度梯度飞片grade of film thickness膜厚级别grade-layer composite梯度复合grade crossing predictor道口信号预报器grade-changing process换级过程graded seal glass tubing递级封接玻璃管graded index optic fiber集束性光导纤维graded flow-block-up分级截流