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81. The device labeled «D», as shown in the illustration, is the bowl __________
The device labeled 'D' is the bowl top because it is the upper conical shell of the centrifuge bowl, enclosing the discs and connecting to the spindle assembly. This part is structurally distinct from the hood, hub, and cover, and is consistently referred to as the 'bowl top' in manufacturer terminology and purifier diagrams.
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