- How does a vaccum flask work. Diagram please if possible?

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Hello,I have an odd birthmark that resembles a constellation. Wanted to know if any one can look at it and let me know . Just curious.? Find the square root of - 40 + 42i? Find the area of an isosceles triangle ABC with base a,side b, angle at base α and angle at the top γ b=8dm γ=55' area=? Line n has equation r = 4i - 4j + 3k + μ(i-2j+2k), μ is a scalar parameter,find in dgrees, the acute angle between the lines m and n.? Are generators heads in diesel and bensin generators all without protruding shaft or not?