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
最新試題
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（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
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