下部温带板
magnetic particle inspection on lower ring in runner of heavy hydroturbine
大型水轮机转轮下环的磁粉探伤
the upper ring or rings are to prevent compression leakage; the lower ring or rings control the amount of oil being deposited on the cylinder wall.
上部的活塞环用来阻止压缩空气泄露;而下部的活塞环用来控制气缸壁上存留下来的机油数量。
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