—______. It's good for my health.
A:It's hard to say
B:I don't think so
C:I agree with you
D:That's too bad
加入NaOH溶液后,下列各溶液中哪种离子数目会减少( )
有A、B、C三个用丝线悬挂着的轻质小球相靠近,结果A与B互相排斥,B与C互相吸引,那么下列说法正确的是( )