市场经济条件下中央银行执行货币政策主要有三种手段，即：公开市场业务、调整再贷款率和改变法定准备金比率。在这三种手段中，后两种手段的运用一般只是暂时性的，能够适应日常性金融管理需要的是公开市场业务，它是中央银行执行货币政策的最得力的手段。公开市场业务是指中? Under the condition of market economy, the central bank implements three main means of monetary policy: open market operations, adjusting the rate of refinancing and changing the statutory reserve ratio. Of the three approaches, the latter two are generally only temporary in their application, and open market operations that are able to adapt to the needs of day-to-day financial management are the most effective means of implementing the monetary policy by the central bank. Open market business refers to?