常温下,0.2 mol·L-1 CH3COOH溶液与0.1 mol·L-1 NaOH溶液等体积混合后(忽略混合前后溶液体积的变化),溶液的pH<7,则下列有关此溶液的叙述正确的是( )
A:溶液中由水电离产生的H+浓度为1×10-7 mol·L-1
B:c(CH3COO-)+c(CH3COOH)-c(Na+)=0.05 mol·L-1
C:溶液中CH3COOH的电离程度小于CH3COONa的水解程度
D:溶液中离子浓度的大小关系为:c(Na+)>c(CH3COO-)>c(H+)>c(OH-)
为了确保用药安全,在使用之前应该仔细阅读使用说明,了解有关内容,下列哪项不属于了解内容之列( )
下列各句中划线的成语,使用不恰当的一组是 ( )
阅读短文, 选出正确答案。
(A)
A picture is on my desk. It is a picture of Mary's family. The man is her father Mr. White. He is a doctor. A woman is behind Mary. She is her mother. She's a teacher. A boy is in the picture, too. He is Mary's brother, Sam. Mary and Sam are in the same school. But they aren't in the same grade. They look like their mother. The White family are English. They come from London.