下列各组离子在水溶液中能大量共存的是( )
A.H+、NO3﹣、OH﹣B.Na+、Ca2+、CO32﹣
C.OH﹣、SO42﹣、Cu2+D.Ba2+、NO3﹣、K+
--- Can you tell me ______ on the Internet? --- OK, mum.
Thousands of houses _______ by the floods in Guangxi last month.
more, and you'll improve your spoken English.
--- I've just got a postcard from my pen friend. --- Let me have a look. Wow.nice card!
--- What is your favourite sport? --- Swimming, I think. It's of all.