根据下列实验现象可以判断某溶液一定呈碱性的是( )
A.常温下,测得溶液的pH<7
B.溶液中滴入酚酞显红色
C.溶液中滴入石蕊显红色
D.溶液中滴入酚酞不显色
答案:B
My family as well as I glad to see you.
A.am
B.are
C.is
D.was
我司HU7953/4(北京=迪拜=喀土穆)航线,总局运行规范中批复的机型是()
A、B767
B、A340
C、B767和A340