成员的完整列表，这些成员属于 CThostFtdcCFMMCBrokerKeyField,包括所有继承而来的类成员

BrokerID	CThostFtdcCFMMCBrokerKeyField
CreateDate	CThostFtdcCFMMCBrokerKeyField
CreateTime	CThostFtdcCFMMCBrokerKeyField
CurrentKey	CThostFtdcCFMMCBrokerKeyField
KeyID	CThostFtdcCFMMCBrokerKeyField
KeyKind	CThostFtdcCFMMCBrokerKeyField
ParticipantID	CThostFtdcCFMMCBrokerKeyField