“物”从供给者到需求者之间存在有一段空间差，由于改变“物”的不同场所存在的位置，创造的效用，称做“时间价值”。
参考答案：错
患者，男性，51岁。不寐多梦，易惊醒，胆怯心悸，遇事善惊，神疲气短，舌质淡，脉弦细。治疗本病，主方宜选（）。
A.安神定志丸
B.温胆汤
C.礞石滚痰汤
D.当归龙荟丸
E.保和丸
Which of the following statements regarding financing bond purchases with margin accounts is FALSE（）
A. The required margin percentage changes daily.
B. Individuals are more likely than institutions to use margin accounts to finance bond purchases.
C. In the U. S. , margin accounts are regulated by the Federal Reserve.
