区分绿碧玺与合成绿色水晶时应使用:().
A.滤色镜
B.偏光镜
C.折光仪
参考答案:C
The development most likely to lead to an increase in the velocity of money is:()
A. a decrease in money interest rates resulting from restrictive fiscal policy.
B. an increase in the expected rate of inflation.
C. a sharp decline in the use of credit cards.
中国常德的诗墙利用防洪墙作载体,被吉尼斯命名为“世界最长的诗书画艺术墙”。