单项选择题
The biggest feature of Trade Fair English in vocabulary use is using precise professional vocabulary,including a lot of professional words, compound words,abbreviations with business meaning and so on.
A．对
B．错
The biggest feature of Trade Fair English in vocabulary use is using precise professional vocabulary,including a lot of professional words, compound words,abbreviations with business meaning and so on.
A．对
B．错
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多项选择题
疫源地消灭的条件为
A、传染源被移走或不再携带病原体
B、周围所有易感者经该病的平均潜伏期后不再发病
C、传染源播散于外界环境的病原体被彻底消灭
D、周围所有易感者经该病的最长潜伏期后不再发病
疫源地消灭的条件为
A、传染源被移走或不再携带病原体
B、周围所有易感者经该病的平均潜伏期后不再发病
C、传染源播散于外界环境的病原体被彻底消灭
D、周围所有易感者经该病的最长潜伏期后不再发病
单项选择题
A．
B．
C．
D．
E．