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Water is flowing through a long horizont...

Water is flowing through a long horizontal tube. Let `P_A and P_B` be the pressures at two points A and B of the tube

A

`P_A` must be equal to `P_B`.

B

`P_A` must be greater than `P_B`,

C

`P_A` must be smaller than `P_B`,

D

`P_A = P_B` only if the cross-sectional area at `A` and `B` are equal.

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A
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