In the transformer fault diagnosis, the fault can be reflected by different characteristic signal from different side, due to complexity of fault reason and phenomenon of power transformer.
电力变压器发生故障的部位多，故障原因、现象复杂，在故障诊断中，可以通过变压器不同方面的特征信号从不同侧面来反映变压器的故障。
According to the complexity of pattern, the mined characteristic patterns could be sorted as frequent item, frequent sequence and frequent sub tree, etc.
根据特征模式复杂性，可分为频繁项模式、频繁序列模式以及频繁子树模式等。
Because risk factor and the project participant's complexity involved in one's own characteristic and allocation of risks, BOT project risk is become BOT difficult point.
由于BOT项目本身的特点及风险分担涉及的风险因素和项目参与方的复杂性，BOT项目风险的分担因此也成为BOT项目理论研究中的难点。
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