短語詞組短語gap gradation 斷級配;跳躍級配;不連續(xù)級配;間斷級配gradation type 級配類型;諧調(diào)曲線類型;曲線類型gradation zone 漸變帶;等級帶Linear gradation 線性排列Social gradation 社會等級tailings gradation 尾砂級配safety gradation 安全分級Test gradation 級配試騐hard gradation 硬調(diào)color gradation 色堦 返回 gradation