black point science outline white thermometer flask ice stand lab filter funnel experiment melting retort Retort Stand And Thermometer clip art 软罐头 立场 温度计 黑点科学大纲白色温度计瓶冰站实验室过滤漏斗实验熔软罐头
Simple set-up to measure the melting point of ice, not most effective method. Shows set-up of retort stand, thermometer funnel and flask. same image also shows a simple filter set-up... Original idea from From GENERAL SCIENCE BY BERTHA M. CLARK, PH.D. (Gutenberg EBook 16593) black & white 实验 筛选器 蒸馏架和温度计
An african-american scientist in a lab coat. His face is by barineau 实验室 实验室 科学 Lab coat worn by scientist with grey hair
<p>黑点科学大纲白色温度计瓶冰站实验室筛选器漏斗实验熔软罐头</p><p><em>反驳站和温度计剪贴画</em></p> 软罐头 立场 温度计 黑点科学大纲白色温度计瓶冰站实验室过滤漏斗实验熔软罐头
black cartoon dog lab animal mammal labrador retriever labs Black Lab clip art vector graphic can be downloaded for free 黑色 剪辑 Black Lab