我们判断样品生锈是导致测试不合格的原因；从以下测试样品的可看出，前两个

We judge that the rust of the sample is the cause of the unqualified test; from the following test samples, it can be seen that the first two samples have been tested, the sample produced a steam drum and rusted, and the value of the test result shows an increasing trend; and it is relatively good The third sample meets the requirements.

We judge that the rust of the sample is the cause of the unqualified test; It can be seen from the of the following test samples that the first two samples are tested, the samples produce steam drums and rust, and the value of the test results shows an increasing trend; The relatively good sample 3 meets the requirements.

We judge that the rust of the sample is the cause of the unqualified test; As can be seen from the following test samples, the first two samples were tested, and the samples produced steam drums and rusted, and the values of the test results showed an increasing trend. The relatively good sample 3 meets the requirements.