题目内容
用干片法测定尿素时,干片的组成自上而 下为( )
2021-10-08
A.支持层,扩散层,试剂层
B.试剂层,支持层,扩散层
C.扩散层,支持层,试剂层
D.扩散层,试剂层,支持层
E.试剂层,扩散层,支持层
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