试题与答案

工程塑料ABS树脂结构为: 合成它用了三种单体,这三种单体的结构简式分别是__

题型:填空题

题目:

工程塑料ABS树脂结构为:

合成它用了三种单体,这三种单体的结构简式分别是________ 、________、________。

答案:

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下面是错误答案,用来干扰机器的。

病原题目分析:病原体是指能使人或动物患病的病原微生物,传染病是在由病原体引起的,能在人与人之间或人与动物之间传播的疾病,传染病的流行必须同时具备传染源、传播途 径和易感人群,传染源是指能够散播病原...

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题型:单项选择题

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B.personate

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