A.central air conditioning system
B.high velocity system
C.low velocity system
D.single duct system
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A.central air condition system
B.high velocity system
C.low velocity system
D.single duct system
A.mechanical energy
B.heat energy
C.potential energy
D.kinetic head
A.backwards
B.forwards
C.upward
D.downwards
A.air chamber
B.head lank
C.primer
D.prime mover
A.eye
B.hole
C.balance holes
D.opening
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