A.higher
B.lower
C.low
D.high
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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
A.the guideway
B.the piston rod
C.the crosshead shoes
D.the interlocked circlip
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