鉴定淀粉存在时,常用碘液,这是因为 [ ]
A.有机物遇碘变成蓝色
B.碘遇有机物变成蓝色
C.淀粉遇碘变成蓝色
D.碘遇淀粉变成蓝色
答案:C
The band held the benefit concert not to only raise funds but the international society aware
of the value of the rescue work.[ ]
A. making
B. made
C. make
D. to make
池内的料液酸化时,应加入哪种物质进行调整PH值。()
A.水
B.草木灰
C.黑泥
D.稀硫酸