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题目某同学为测定空气里氧气的含量,设计了如图所示的实验装置.该同学在“金属梯”的每一步的凹处放置一颗用滤纸吸干水后的白磷,用放大镜会聚6V 手电筒光于靠
A classmate designed the experimental device shown in the figure to determine the oxygen content in the air. The student placed a white phosphorus with water through a filter paper in the recess of each step of the metal ladder and used a magnifying glass. Convergence 6V flashlight light on