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2019-11-11View Original

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9. When using a scraper to scrape the surface, its direction should generally form an angle of (??????) with the axis direction, and the operation should be carried out in two passes in a crosswise manner. ? A、45°??B、60°??C、90° The answer to the question from yesterday was B. 8. A piston ring is an open-ended ring; its diameter in its free state should be (?greater than)the diameter of the cylinder. ?A. Equal to?? B. Greater than?? C. Less than?

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