Very small pressure difference (< 5 mm water coloumn) can be most conveniently measured by a/an __________ manometer.

Very small pressure difference (< 5 mm water coloumn) can be most conv

1.	Very small pressure difference (< 5 mm water coloumn) can be most conveniently measured by a/an __________ manometer.
A.	U-tube water.
B.	U-tube mercury.
C.	inclined tube mercury.
D.	inclined tube water.
Answer» E.

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Very small pressure difference (< 5 mm water coloumn) can be most conveniently measured by a/an __________ manometer.

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