在△ABC中，角A，B，C的对边分别为a，b，c．已知A= $\frac{\pi }{4}$ ，bsin（ $\frac{\pi }{4}$ +C）﹣csin（ $\frac{\pi }{4}$ +B）=a，

长期以来，人们普遍认为《红楼梦》的前80回是曹雪芹写的，后40回是高鹗续写的。但数学统计进入文学领域后，这个说法遭到质疑。利用计算机计算作者平均词长和平均句长，对作品中作者使用的字、词、句的频率进行统计研究，从而了解作者的风格，这被称为计算风格学。计算风格学的出现和发展，在判断作者真伪、考证作者方面大显身手。上述材料表明                                       （   ）
①人类实践的手段不断丰富和完善   ②实践是认识的目的和检验认识正确与否的唯一标准   ③人的认识是不断发展的    ④一切历史定论作为感性认识均有待于上升到理性认识

在25℃时将pH＝11 的NaOH 溶液与pH＝3 的CH₃COOH溶液等体积混合后，下列关系式中正确的是（    ）

   Once there was a king. He liked to write stories. He thought his stories were good, so he like to show them to people. As people were afraid of him, they all said his stories were very good. One day, the king showed some of his best stories to a famous writer. He wanted the writer to praise(赞美)these stories. But the writer said his stories were so bad that he should throw them into the fire. The king got very angry and sent him to prison(监狱). After some time, the king set him free and ordered him to come to his palace(宫殿). Again he showed some of his new Stories and asked what he thought of them. After reading them, the writer at once turned to the soldiers and said, "Take me back to the prison."

下列关于“探究酵母菌细胞呼吸的方式”的探究，说法不正确的是（    ）