题目内容

比色分析中滤光片的作用是______,它与有色溶液的关系是______,对同一种溶液选不同的滤光片时其吸光度值____

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一定量的KHC2O4·H2C2O4·2H2O作为还原剂和作为酸时,消耗的KMnO4和NaOH的物质的量之比为n(KMnO4):n(NaOH)=______。

A.peasantB.presentC.promiseD.possession

A. peasant
B. present
C. promise
D. possession

Anybody will do, _______ he is responsible for that.

A. as far as
B. so far as
C. as long as
D. as soon as

A.determineB.demandC.medicalD.belief

A. determine
B. demand
C. medical
D. belief

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