MQL5参考标准程序库交易类CAccountInfoMargin LoginTradeModeTradeModeDescriptionLeverageStopoutModeStopoutModeDescriptionMarginModeMarginModeDescriptionTradeAllowedTradeExpertLimitOrdersBalanceCreditProfitEquityMarginFreeMarginMarginLevelMarginCallMarginStopOutNameServerCurrencyCompanyInfoIntegerInfoDoubleInfoStringOrderProfitCheckMarginCheckFreeMarginCheckMaxLotCheck Margin 获取保留保证金的额度。 double Margin() const 返回值 保留保证金的额度 (以入金货币为单位)。 Equity FreeMargin