The hidden multiple exchange rate systems mainly include the following ways:（）
A. to give different financial subsidies to export commodities according to different categories
B. to use shadow exchange rate
C. to implement foreign exchange transfer certificate or foreign exchange retention system
D. to give different tax relief to export goods according to different categories
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（）is not only the “source” of international reserve stock, but also the “flow” of international reserve expenditure
A. International trade
B. External economy
C. Domestic economy
D. Balance of payments
The famous “Triffin dilemma” in the history of international finance is（）
A. the contradiction between the amount of gold reserves and the amount of money issued
B. the contradiction between economic development and the equilibrium of balance of payments
C. the contradiction between international liquidity and the confidence in the dollar
D. the north- south contradiction
The specific contents of exchange rate systems include（）
A. legal tender
B. determination of exchange rate
C. unlimited law compensation
D. adjustment of exchange rate
The implementation of multiple exchange rate system belongs to the type of（）in exchange control
A. quantity control
B. price control
C. direct control
D. indirect control
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