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

BrokerID	CThostFtdcSyncingInstrumentMarginRateField
HedgeFlag	CThostFtdcSyncingInstrumentMarginRateField
InstrumentID	CThostFtdcSyncingInstrumentMarginRateField
InvestorID	CThostFtdcSyncingInstrumentMarginRateField
InvestorRange	CThostFtdcSyncingInstrumentMarginRateField
IsRelative	CThostFtdcSyncingInstrumentMarginRateField
LongMarginRatioByMoney	CThostFtdcSyncingInstrumentMarginRateField
LongMarginRatioByVolume	CThostFtdcSyncingInstrumentMarginRateField
ShortMarginRatioByMoney	CThostFtdcSyncingInstrumentMarginRateField
ShortMarginRatioByVolume	CThostFtdcSyncingInstrumentMarginRateField