根据短文内容，选择正确答案。

    I had a summer camp with my classmates for a week last year.

    Early in the morning, we gathered(聚集) at the bus station. After saying goodbye to our parents, we got on the buses. It took us more than two hours to arrive at the campground.

    We got off the buses happily. Laughing and shouting, we jumped and ran all over the place. It was the first time for us to be away from the parents. Some of us started to feel homesick(想家). However, when the night party and dances began, we felt excited again.

    The next day, everybody rushed to the boating class, hoping to be at the head of the others. At first, my friends and I worked hard, but the boat wouldn't listen to us and kept going round and round. Then the teacher taught us how to work together. After many tries, we did much better.

     Swimming class was my favourite. It was about the hottest time of a day and the best time to stay in the cool water. The swimming teacher was a funny man, and during the class he often made us laugh happily. During the week I learned a lot of new things and made many new friends. I also learned how to take care of myself.

春游日记：我们在白云湖边举行联欢活动。站在湖边望去，笔直的白云河直通大海。村庄均匀的散布在碧绿的麦田中，白云镇中一座高大的教堂从民居中拔起，教堂顶部巨大的十字十分醒目(形状如景观图)。在镇东南面乡村路与公路交汇处有一座工厂，工厂的烟囱里不停的冒出浓浓的黑烟。

我市某中学决定在学生中开展丢沙包、打篮球、跳大绳和踢毽球四种项目的活动，为了解学生对四种项目的喜欢情况，随机调查了该校m 名学生最喜欢的一种项目（每名学生必选且只能选择四种活动项目的一种），并将调查结果绘制成如下的不完整的统计图表：

学生最喜欢的活动项目的人数统计表

根据图表中提供的信息，解答下列问题：

下列关于植物组织培养中灭菌操作的叙述中，错误的是（ ）