MQL5 リファレンス標準ライブラリトレードクラスCAccountInfoFreeMargin LoginTradeModeTradeModeDescriptionLeverageStopoutModeStopoutModeDescriptionMarginModeMarginModeDescriptionTradeAllowedTradeExpertLimitOrdersBalanceCreditProfitEquityMarginFreeMarginMarginLevelMarginCallMarginStopOutNameServerCurrencyCompanyInfoIntegerInfoDoubleInfoStringOrderProfitCheckMarginCheckFreeMarginCheckMaxLotCheck FreeMargin 여유 마진 금액 가져오기. double FreeMargin() const 값 반환 여유 마진 금액 (예금 통화). Margin MarginLevel