单项选择题

It is an irrevocable letter of credit which can not ( ).

A．change
B．be changed
C．changing
D．changed
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单项选择题
汉译英：“滚动试验；堆码试验；振动试验”，正确的翻译为( )。
A．stacking test；rolling test；vibration test
B．rolling test；stacking test；vibration test
C．vibration test；stacking test；rolling test
D．rolling test；vibration test；stacking test
单项选择题
汉译英：“动植物检疫；宰前兽医检验”，正确的翻译为( )。
A．animal and plant quarantine；ante-mortem veterinary inspection
B．ante-mortem veterinary inspection；animal and plant quarantine
C．animal and plant quarantine；detection of defects
D．detection of defects；ante-mortem veterinary inspection
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