The systematic testing of components or equipment during manufacturing makes this non-destructive conditionmandatory when testing a sample.
在元器件或设备生产过程中的系统化测试，测试样品时对样品不产生破坏是强制性条件。
2
It may however be the symptom of an underlying pathological condition; and it is therefore mandatory to diagnose properly its origin in order to propose an adequate treatment.