It is an irrevocable( )which can not be changed．

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It is an irrevocable( )which can not be changed．
A.letter of credit
B.bill of lading
C.quarantine
D.quality

本题关键词:BE值,IT,白兰氏虫草菌丝体鸡精(BRAND′S ESSENCE OF CHICKEN WITH COEDYCEPS);