A.REEFER
B.RO/RO SHIP
C.CONTAINER
D.TANKER
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A.SEA CHEST
B.SCUPPER
C.SCUTTLE
D.SEA PORT
A.Power factor
B.Power ratio
C.compression ratio
D.Compression factor
A.should agitate
B.should not agitate
C.should mix up
D.should not add up
A.disperse
B.coalesce
C.compress
D.shrinkage
A.even if
B.so that
C.such that
D.in order that
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（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
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