It is found that the BL Lac objects in our sample show stronger activity with smaller flares and flickers in high state than that in low state.

• 当然太阳活动现象的复杂性不可能用简单的对应关系来说明，而且对速度场螺度的了解还非常肤浅，进一步的深入研究显得非常必要。