OKCoin is a Bitcoin company in China with core product lines of a Bitcoin exchange, and a mobile consumer payment and lending app. OKCoin Exchange China operates CNY/BTC spot pair with margin trading from its Beijing entity, while OKCoin International operates USD/BTC spot pair with margin trading and BTC/USD futures from its Singapore entity.
USD/BTC is not a spot pair,
A: No

Street lights<br>Ben lived on a dark street. There was an increase of car break-ins in his neighborhood. Ben started a petition to get street lights for his street. After the lights were placed, crime on his street dropped. The neighbors were glad that Ben started the petition.
ben lived on a dark street so he peitioned for street lights on his street
A: Yes

Stokes shift is the difference (in wavelength or frequency units) between positions of the band maxima of the absorption and emission spectra (fluorescence and Raman being two examples) of the same electronic transition. It is named after Irish physicist George G. Stokes.
George G. Stokes discovered Stokes shift
A: