A.upwards；top
B.upwards；bottom
C.downwards；top
D.downwards；bottom
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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
A.advantages
B.disadvantages
C.power advantages
D.power disadvantages
A.semi-built
B.built-up
C.solid forged
D.individual forged
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