A.at the lowest point
B.near the batteries
C.at the highest point
D.only when charging is in progress
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A.take part
B.watch
C.go to their quarters
D.stay out of the way and do what they want
A.obliged
B.obliging
C.oblige
D.being obliged
A.repair
B.repaired
C.repairing
D.to repair
A.good getting ground
B.good holding ground
C.good grabbing ground
D.good handling ground
A.existing visibility conditions，limited only by the curvature of the Earth
B.perfect visibility conditions，limited only by the curvature of the Earth
C.existing visibility conditions，limited only by the intensity of the light
D.perfect visibility conditions，limited only by interference from background lighting
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