My name is Tom. I am____(九). I like____(白色的). It's a clean color. I have two basketballs. Look, they are____(在……下面) the bed. I think it's ____ (容易的) for me to play basketball. I always play it after class. Oh, what about my____(父母亲). My father____(喜欢) sports, too. He has____(一些) balls. You can see the balls____(到处) in his bedroom. My mother is a ____(教师). She doesn't____(有) any balls, she only watches sports games on TV.

 化学科学的发展离不开定量研究．下列有关定量实验的误差分析中，不正确的是（　　）