NO.PZ2023091802000015
问题如下：
Which of the following descriptions about exchange trading system is most correct?
选项：
A.The contracts traded do not have to be the standard contracts
B.Participants contact each other directly to trade.
C.Trades are made in such a way as to reduce credit risk.
D.If there is a misunderstanding, the call between the two parties is recorded.
解释：
C
如题
