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For the given assembly: 25 H7/g8, match Group A with Group B. Group A: P. H, Q. IT8, R. IT7, S. g Group B: I. Shaft type, II. Hole type, III. Hole tolerance grade, IV. Shaft tolerance grade

1. P-I, Q-III, R-IV, S-II
2. P-I, Q-IV, R-III, S-II
3. P-II, Q-III, R-IV, S-I
4. P-II, Q-IV, R-III, S-I

Correct answer: P-II, Q-III, R-IV, S-I

Solution

In the fit 25 H7/g8, H is an uppercase letter, so it denotes a hole type, and g is a lowercase letter, so it denotes a shaft type. IT7 and IT8 are tolerance grades, with IT7 being grade 7 and IT8 being grade 8. Therefore P-II, Q-III, R-IV, S-I is the correct matching.

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