题目内容

________ is unkown to us all.

A. Where did she put it
B. Where she put it
C. That where she put it
D. In which she put it

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His suggestion ______ to see the art exhibition interested every one of us.

A. that we go
B. which we should go
C. that we would go
D. when we should go

There is much chance _____ Bill will recover from his injury in time for the race.

A. that
B. which
C. when
D. where

利用金属锌与酸作用产生新生态氧,与微量砷盐反应生成具挥发性的砷化氢,还原二乙基二硫代氨基甲酸银,产生红色的胶态银,与同条件下定量的标准砷溶液所呈色进行目视比色或在510nm浓长处测定吸收度,进行比较,以控制砷盐的限量。该方法称为( )

A. 二乙基二硫代氨基甲酸银法
B. 古蔡氏法
C. 白田道夫法
D. 硫氰酸盐法

利用金属锌与酸作用产生新生态氧,与微量砷盐反应生成具挥发性的砷化氢,还原二乙基二硫代氨基甲酸银,产生( )的胶态银,与同条件下定量的标准砷溶液所呈色进行目视比色或在510nm浓长处测定吸收度,进行比较,以控制砷盐的限量。

A. 紫色
B. 白色
C. 黄色
D. 红色
E. 黑色

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