A.
工序基准与定位基准间的尺寸变化量 The dimensional variation between the operational datum and the location datum
B.
本工序要保证的尺寸大小 The dimension of this operation be guaranteed
C.
本工序要保证的尺寸精度 The dimensional accuracy of this operation be guaranteed
D.
定位元件和定位基准本身的制造精度 The manufacturing accuracy of the location element and the location reference itself