1, first of all, the delivery date of RB is not 15, and 15 is the last trading day of the rebar contract in the current month. Because the delivery month of rebar is1~ 65438+February, there will be no RB 13 10, but RB 14 10. There is no difference between normal and abnormal, but it is much higher because RB 14 10 is a new contract, not RB 13 10. But the graphic display is continuous.

This question is similar to the first one. Maybe you are confused about the concept of changing the moon. The new contract is different from the previous one, so it has little to do with it, just a graphical continuation.

3. The main contract of 3.RB is usually 1, 5, 10 month, but not necessarily. If a large iron and steel enterprise hedges in a certain month and holds a very large position, it is usually the main contract. The main contract is generally the largest position and turnover.