若右图表示植物细胞渗透作用的图解,下列说法错误的是( ) A.植物细胞的原生质层相当于一层半透膜 B.一定条件下,活的、成熟的植物细胞
某化学反应2AB+D在不同条件下进行,B、D起始浓度为0,反应物A的浓度(mol·L-1)随反应时间(min)的变化情况如下表: 根据上述数据,完成下列填空:(1)在实
[1] How often does your child automatically pick up a book, a magazine, a newspaper, or other printed materials simply for the pleasure of reading? Experts have begun to realize that a young pers
Life in 21st century(世纪) will be different from the life in the 20th century , because many changes will take place in the century, but what will the change be? The population(人
下列对于自然带的地域分异叙述,正确的是 A. 纬度地带性是以降水量多寡为基础的 B. 经度地带性反映了不同地区热量的变化