Engine : Expired / Motor Plants and Auxiliary Boilers - 438/354
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| The upper piston rings in large, slow-speed, two-stroke/ cycle diesel engines are most effectively lubricated by oil __________. |
| A) fed from mechanical lubricators |
| B) thrown off from the main bearings |
| C) supplied from wick fed drip lubricators |
| D) flow from a centrifugal or banjo oiler |
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