欧洲的一种山楂属植物，叶深裂，果亮红色；在园艺上已培育出各种不同的类型，常用作绿篱；在北美东部成为逸生种。
European hawthorn having deeply cleft leaves and bright red fruits; widely cultivated in many varieties and often grown as impenetrable hedges; established as an escape in eastern North America.
导水叶力矩具有自关闭特性，对机组防飞逸具有较好的效果。
The force moment of guiding water blade has self close function, which can effectively protect the runaway of generating unit.
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