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Шалгаж буй хавхлага Даралтын хэмжүүр. Термометр. Урсгал хэмжигч. Гэсэн хэдий ч алдагдах урсац нь ихэвчлэн маш бага байдаг тул энгийн урсгал хэмжигчээр нарийн хэмжиж болохгүй. Хэрэв тохиромжтой микро урсгал хэмжигч байхгүй бол урсгал хэмжигчийг хэмжих аяга болон секундомер ашиглах талаар авч үзэх хэрэгтэй. 2) Тестийн процесс
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