25℃时,在10mL浓度均为0.1mol/LNaOH和NH3·H2O混合溶液中,滴加0.1mol/L的盐酸,下列有关溶液中粒子浓度关系正确的是( )
A:未加盐酸时:c(OH-)>c(Na+)=c(NH3·H2O)
B:加入10mL盐酸时:c(NH4+) +c(H+) = c(OH-)
C:加入盐酸至溶液pH=7时:c(Cl-) = c(Na+)
D:加入20mL盐酸时:c(Cl-) =c(NH4+) +c(Na+)
The director was fully convinced that this moving story, if ______ for television, would be a hit.
-- Would you please show me the way ______ the bank?
-- Yes, go straight ahead. It's in front of a school.
下面是约处于同一时期的中西两位历史人物和他们的著作。他们的科技成就形成强烈反差,这种反差说明的本质是( ) 徐光启和《农政全书》书影 哥白尼和《天体运行论》书稿
下列生物中,能产生抗生素的是( )