A.telescopic pipe
B.large bore pipe
C.generating pipe
D.central pipe
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A.flat surface
B.mirror finish
C.sloping surface
D.inclined surface
A.upwards；top
B.upwards；bottom
C.downwards；top
D.downwards；bottom
A.accelerates；decelerates
B.accelerates；accelerates
C.decelerates；decelerates
D.decelerates；accelerates
A.up and down；reciprocating
B.up and down；rotating
C.back and forth；reciprocating
D.back and forth；rotating
A.rotary；reciprocating
B.up and down；fore and aft
C.fore and aft；up and down
D.up and down；rotary
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