“实时通”凭证选择“汇兑功能”及“汇（本）票申请功能”的，凭证左联作客户回单联，必须随正联同时提交银行办理。（）
参考答案：对
Generally speaking, when the Herfindahl-Hirschman Index (HHI) is calculated by summing the squared percentage market shares, how many largest firms data is used in a industry, supposing there is a large number of firms in the industry:（）
A．4
B．10
C．50
