Nio (NIO) begins trial operation of high-speed EV battery swap stations

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NUVEEN MUNICIPAL OPPORTUNITY FUND, Inc. (NYSE: NIO) Delayed: 3.54 +0.06 (1.72%)
Previous Close $3.48    52 Week High $14.86 
Open $3.45    52 Week Low $13.31 
Day High $3.55    P/E N/A 
Day Low $3.43    EPS $0.00 
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