问题
单项选择题
锑盐
A.先用硝酸或溴水氧化
B.先加酸性氯化亚锑还原
C.改用白田道夫法
D.先加氰化钾掩蔽
E.先加草酸生成沉淀
答案
参考答案:C
锑盐
A.先用硝酸或溴水氧化
B.先加酸性氯化亚锑还原
C.改用白田道夫法
D.先加氰化钾掩蔽
E.先加草酸生成沉淀
参考答案:C
阅读下面短文,从方框中选出适当的词,并用其正确的形式填空,使短文意思完整。每词限用一次。
I think everyday activities at home can make a difference to the environment. I feel proud of 4 , and I will not only keep saving energy but also advise others to do the same things as me. If everyone cares about 5 the environment, I’m sure we’ll have a better life. |