单面斜纹织物具有正反面，两面是不能互换的。
Uneven twill fabrics have a right and a wrong side and therefore are not considered reversible.
第二，成套轴承在装配前经过严格的精密选配。不能互换使用锭脚型腔内的其它零件。
Second, the complete bearing undergoes the strict precise match before the assembly. Cannot exchange in the use spindle foot die space other components.
出油阀和出油阀座也是一对精密偶件，配对研磨后不能互换，其配合间隙为0.01。
Valve seat and the oil is even a pair of precision parts, after the pair are not interchangeable grinding, and its clearance of 0.01.
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