Exclusive-China's Nio explores investment, tech alliances with Mercedes-sources

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NUVEEN MUNICIPAL OPPORTUNITY FUND, Inc. (NYSE: NIO) Delayed: 4.53 -0.05 (1.09%)
Previous Close $4.58    52 Week High $14.86 
Open $4.60    52 Week Low $13.31 
Day High $4.63    P/E N/A 
Day Low $4.52    EPS $0.00 
Volume 27,284,383