A.one
B.less than one
C.more than one
D.negative one
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A.is small
B.may be neglected
C.is useful
D.is considerable
A.remained
B.still
C.no longer
D.much mere
A.Desired value
B.Set value
C.Measured value
D.Deviation
A.Accommodation heating system
B.Steering gear
C.Boiler control
D.Cargo control
A.paralleling
B.series-mounting
C.running
D.control
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（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.