A.pressure
B.velocity
C.gravity
D.viscosity
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A.the temperature
B.the viscosity
C.the gravity
D.the size
A.water level
B.water flow
C.temperature
D.pressure
A.flat
B.slat
C.sweet
D.acid
A.starters
B.pressure switches
C.pressure
D.water
A.forced circulating pump
B.compressed air
C.gravity tank
D.bead tank
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