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Right Triangles - Clark University | Challenge Convention. Change Our World.

67. An equilateral triangle ABC has three 60 vertex angles. Drop a perpendicular from one vertex, say vertex C, and you get two congruent right triangles ACF and BCF, and you can find the length of that perpendicular, and that’s the altitude of the equila...

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(翻攝自youtube) 老鼠體內寄生蟲以及傳染病: 鼠體外寄生蟲,如蚤、蜱、滿等; 鼠帶有病原體的排泄物或口水,污染水源或食物致病,或經空氣吸入 鼠咬傷人體所致 (如細菌性傷口發炎) 常見的鼠傳疾病 鼠疫 (plague) 鼠疫又叫「黑死病」,是一種可以致命的疫症,經受感染的黑鼠跳蚤咬人而傳播。...

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