假定中央银行采用钉住汇率，试述下列事件在货币市场恢复均衡后、对价格水平和中央银行的官方储备持有量有什么影响。 a．货币币值低估； b．中央银行购买国内资产； c．外国价格上升； d．外国利率上升； e．预期未来币值低估。 Assume that the central bank pegs the exchange rate．Describe the effects on the price level and on the official reserve holdings of the central bank of the following events．once the money market equilibri um is reestablished． a．A devaluation of the currency． b．A purchase of domestic assets by the central bank． c．A rise in foreign prices． d．A rise in the foreign interest rate． e．An anticipation of a future devaluation．