graded joint seal 分级过渡封接

graded joint tube 刻度管

graded joint sand 过筛砂

graded joint slot 梯形槽

graded joint size 分级规格尺寸

graded joint tilling 逐层耕作

graded joint pressing 分段压制

graded joint junction 缓变结

graded joint unconformity 过渡不整合