MQL5 リファレンス標準ライブラリトレードクラスCAccountInfoMarginLevel LoginTradeModeTradeModeDescriptionLeverageStopoutModeStopoutModeDescriptionMarginModeMarginModeDescriptionTradeAllowedTradeExpertLimitOrdersBalanceCreditProfitEquityMarginFreeMarginMarginLevelMarginCallMarginStopOutNameServerCurrencyCompanyInfoIntegerInfoDoubleInfoStringOrderProfitCheckMarginCheckFreeMarginCheckMaxLotCheck MarginLevel 마진 수준 가져오기. double MarginLevel() const 값 반환 마진 수준. FreeMargin MarginCall