exchange.GetQuoteCurrency()函数用于获取当前交易对的计价币名称，即quoteCurrency。
exchange.GetQuoteCurrency()函数返回当前交易对的计价币名称。
string
exchange.GetQuoteCurrency()
例如：国内商品期货的交易所对象返回CNY。
{@fun/Account/exchange.GetCurrency exchange.GetCurrency}
exchange.GetCurrency Futures