A:Ag+、Na+、Cl﹣、K+
B:Na+、Cu2+、SO42﹣、NO3﹣
C:Mg2+、Na+、SO42﹣、Cl﹣
D:Ba2+、HCO3﹣、NO3﹣、K+
下列实验操作正确的是( )
①线粒体 ②核糖体 ③中心体 ④染色体 ⑤高尔基体 ⑥细胞膜 ⑦内质网.
判断下列句子与短文内容是否相符。
Hi.I'm an English girl.I'm Jane.I'm 143 cm tall and 42 kg.I studied in Shanghai last year.I had many Chinese friends.My best friend is Liu Ying.She is 161 cm tall and 51 kg.Last weekend we went to a park.We went shopping,then we saw a film.We were very happy.I love my friends.