Dear students, please read every sentence carefully. _______ you are, _______ mistakes you’ll make.
A:The more carefully; the fewer
B:The more careful; the less
C:The more carefully; the less
D:The more careful; the fewer
瓶号
甲
乙
丙
加入物质
50毫升灭菌牛奶
瓶口处理
不作处理
用消毒棉球塞住
温度
5℃
25℃
请据表分析,本实验设计包含的对照实验组数及其实验变量分别是( )