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Rings for automotive engine usually have butt joints, but in some heavy-duty engines, the joints may be angled, lapped, or of the sealed type. 汽車發(fā)動機上的活塞環(huán)通常是有接口的。但在一些重型發(fā)動機上，活塞環(huán)的接口可以是斜角接口，搭接式或密封式的。