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Across the normal shock, fluid properties change in such a manner that the:

1. Velocity of flow is subsonic

2. Pressure increases

3. Specific volume decreases

4. Temperature decreases

Which of the above are correct?

(A) 1, 2, 3, and 4         (B) 2, 3 and 4 only

(C) 1 and 4 only          (D) 1, 2 and 3 only

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