齿轮泵一般应用于（ ）系统。
A、低压
B、中压
C、高压
D、均不对

单项选择题If a country with a fixed exchange rate faces a fundamental disequilibrium because it has a large, ongoing surplus in it official settlements balance, which of the following policies can it employ to try to achieve external balance?( )A.Impose import barriersB.Raise interest ratesC.Allow the exchange rate to floatD.Obtain a loan from the IMF

单项选择题在现代商务交往中，韩国人习惯如何与人问候? A、握手 B、行注目礼 C、招手 D、口头呼唤