扇中剖面沉积物具有多期旋回的特征,以下表述正确的是( )
A. 每期旋回沉积物粒度均为下粗上细
B. 每期旋回沉积物厚度相等
C. 多期旋回与水动力条件的变化有关
D. 多期旋回性与构造抬升有关
扇根与扇端相比,其特征描述正确的是()
A. 粒度更粗
B. 地形坡度更陡
C. 面积更大
D. 水动力条件更弱
Which is not one of the criteria necessary for a commodity to make a suitable medium of exchange?
A. It should be durable.
B. It should be of standardized quality.
C. It should be valuable relative to its weight.
D. It should have intrinsic value.
A central bank can help stop a bank panic by
A. . raising the required reserve ratio.
B. calling in consumer loans
C. acting as a lender of last resort.
D. decreasing income taxes
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