单项选择题According to purchasing-power parity, if the dollar price of oil is higher in New York than in London, arbitrageurs will ___ oil in New York and _____ oil in London to drive _____ the price of oil in New York. ( )A.buy; sell; up B.buy; sell; down C.sell; buy; up D.sell; buy; down
单项选择题电压比较器的电压传输特性有( )个要素。 A、一 B、二 C、三 D、四