问题如下：
Corporate bond secondary market trading most often occurs:
选项：
A. on a book-entry basis.
B. on organized exchanges.
C. prior to settlement at T + 1.
解释：
A is correct.
The vast majority of corporate bonds are traded in over-the-counter (OTC) markets that use electronic trading platforms through which users submit buy and sell orders. Settlement of trades in the OTC markets occurs by means of a simultaneous exchange of bonds for cash on the books of the clearing system "on a paperless, computerized book-entry basis."
请问强化班14页不是写着T+0价格吗？哪些交割时间是需要掌握的，时间是多少？能帮忙总结一下吗？
