A.at all times
B.in the bottom return mode
C.in the volume reverberation mode
D.only when there is no current
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A.heavy
B.easily damaged
C.affected by temperature
D.costly relative to the strength ratio
A.stopper
B.screen
C.filter
D.restrictor
A.rising warm air
B.proximity to a low pressure area
C.inward spiraling circulation
D.clear dry weather
A.Has there been
B.Have there been
C.Has there
D.Have there
A.From
B.By
C.on
D.With
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