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1·A measuring method combining main magnetic flux and magnetic flux leakage for approaching the residual wall thickness of the oil well tubing in-service was presented.

提出采用主磁通与漏磁通相结合的方法检测在用油管剩余壁厚的方法。

2·It 'mainly concludes these characteristic parameters, such as visual, dryness, ion contamination, welding flux residual, surface insulation resistance and electric migration et al.

这些参数主要包括：外观、干燥度、离子污染、助焊剂残留、表面绝缘电阻和电迁移等。

3·The object of the present invention is to provide a rare earth magnet which enables to achieve a good balance between high coercive force and high residual magnetic flux density, and a magnet motor.

提供一种稀土类磁铁以及永磁电动机，该稀土类磁铁可以兼具高顽磁力和高剩磁通密度。