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1、操纵自变量根据实验目的和假设找出并控制好自变量是实验成功的关键因素。自变量一般是题目已知的或是可以根据题目提供的已知条件来获取。例如:在验证“CO2是光合作用的必需原料”
1. Manipulating the independent variable Finding and controlling the independent variable based on the purpose and hypothesis of the experiment is a key factor in the success of the experiment. The independent variable is generally known as the topic or can be obtained based on the known conditions provided by the topic. For example: in the verification “CO2 is a necessary raw material for photosynthesis”