20Whichofthefollowingwillincreaseacountry’sprotectionagainstimports?
Aanappreciationofitsexchangerate
Banincreaseinitsinflationrate
Careductioninthesizeofexistingimportquotas
Dareductioninsubsidiestodomesticproducers
A、B、C、D如何理解?汇率问题中的本币汇率和外币汇率,如何区别?