The knowledge point of this problem is the revaluation of market value. Market value revaluation refers to reassessing the market value of trading account positions. Intuitively speaking, it is to calculate the value according to the market price as much as possible on the basis of the market price. In addition, it should be noted that when measuring values, the data based on reality is always better than the values derived from the model, so everything is based on the market. When there is no market price to be based on, the value determined by the model will be reconsidered. Item AD is the knowledge we often encounter, and item C is the explanation of die-cutting version.