A.viscosity
B.density
C.velocity
D.electricity
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A.higher
B.lower
C.low
D.high
A.be less than
B.be larger than
C.be as large as
D.not be so large as
A.bosses
B.through bolts
C.machine-turned recesses
D.long studs
A.a mark
B.a bolt
C.a dowel pin
D.a measuring tool
A.gravity disc
B.centrifugal bowl
C.a stack of discs
D.main sealing ring
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