单项选择题 选择人群出价作用的推广计划，将建立的人群绑定至计划，当计划中的广告被搜索词触发，同时搜索用户与人群条件匹配时，按人群出价系数进行独立出价，一个计划最多绑定（）个人群；一个人群最多绑定（）个计划

单项选择题 You are a U.S. investor and currently have a portfolio worth :100 million in German bonds. The current spot exchange rate is €2/$. The current one-year market interest rates are 6 percent in the euro area and 10 percent in the United States. One-year currency options are quoted with a strike price of $0.50/€; a call on euros is quoted at $0.01 per euro, and a put on euros is quoted at $0.012 per euro. You are worried that inflation in euro area will cause a drop in the euro. You consider using forward contracts or options to hedge the currency risk. a. What is the one-year forward exchange rate $::? b. Calculate the dollar value of your portfolio, assuming that its euro value stays at €100 million; use $:€ spot exchange rates equal in one year to 1.6, 1.8, 2, 2.2, and 2.4. First consider a currency forward hedge, then a currency option insurance. c. What could make your forward hedge imperfect?

问答题 检验实际光学系统成像质量的常用方法有哪几种？