向纯水中加入少量NaHSO4固体(温度不变)。则溶液的( ) A.酸性增强 B.c(H+)·c(OH-)乘积增大C.c(OH-)减小 D.pH增大 答案:AC解析:NaHSO4====Na++ H++,KW为一定值,c(H+)增大,所以c(OH-)减小。
We needed a new cupboard for the kitchen.
So Peter made ________ from some wood we had.
[ ]
A.it
B.one
C.himself
D.another