A.along
B.will
C.throughout
D.for
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A.an alternating
B.a rush
C.a direct
D.an exciting
A.disconnected
B.switched off
C.cut off
D.connected
A.voltage
B.current
C.power
D.frequency
A.An alternator
B.fresh water generator
C.A compressor
D.A clarifier
A.Switches
B.panels
C.alarm units
D.safety devices
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（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
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