A.up and down；reciprocating
B.up and down；rotating
C.back and forth；reciprocating
D.back and forth；rotating
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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
A.smaller
B.larger
C.higher
D.lower
A.enough；to
B.too；to
C.such；so
D.so；that
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