问题
单项选择题
It is an irrevocable( )which can not be changed．
A．letter of credit
B．bill of lading
C．quarantine
D．quality
答案
参考答案：C
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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
参考答案：C