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Ammonia, one of the earliest known nitrogen compounds, was originally produced by dis-tilling organic materials.
Ammonia, one of the earliest known nitrogen compounds, was originally produced by dis-tilling organic materials.
admin
2012-07-29
63
问题
Ammonia, one of the earliest known nitrogen compounds, was originally produced by dis-tilling organic
materials
.
选项
A、masses
B、fabrics
C、substances
D、liquids
答案
C
解析
物质
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职称英语卫生类A级题库职称英语分类
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职称英语
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