arii5571 arii5571

21-02-2017
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An iris diaphragm is a set of overlapping metal plates that can expand out to allow more light or fold in on each other to reduce the amount of light

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turtles420 turtles420

21-02-2017

I believe the answer is True

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2long2serve2nations 2long2serve2nations

18-01-2019

its false because idk its false i just know just took test lol.Good luck boys!!!

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