A:若混合后所得溶液呈中性,则HA肯定是强酸、BOH肯定是强碱
B:若混合前酸、碱pH之和等于14,混合后所得溶液呈碱性,则BOH肯定是弱碱
C:若混合前酸、碱物质的量浓度相同,混合后所得溶液呈酸性,则HA肯定是弱酸
D:若混合后所得溶液呈酸性,则混合溶液中离子浓度一定满足
He thought his marketing plan was perfect, but ____(正相反), it was not and it failed.
如图,平面内的两条相交直线OP1和OP2将该平面分割成四个部分Ⅰ、Ⅱ、Ⅲ、Ⅳ(不包含边界),设OP→=mOP1→+nOP2→,且点P落在第Ⅳ部分, 则实数m、n满足( )