No amendment, cancellation or refund is allowed once document is issued.
套票发出后，将不可更改、取消或退款。
DCC is responsible to control the documents described in this procedure, namely printing, distribution, original document keeping, cancellation and obsolete etc.
文件控制中心负责本程序所规定文件的控制，即打印、发放、正本保管、回收、作废等。
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