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Which one of the following statements relates to expression 'pvc' ?   

(a) Pressure rise in 11 duct due to normal

{b) Pressure rise in a duct due to abrupt closure of valve in the duct

(c) Pressure rise in a duct due to slow opening of valve in the duct

(d) Pressure rise in a duct due to propagation of supersonic wave through the duct

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