Answer:
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1.) Averages could be done
2.) Experiments or "works" could be repeated many times
3.) Limiting factors likely to introduce errors that could be avoided
1) Не имеет формы единственного числа существительное ДРОВА
2) Единственное число
Мужской род Женский род Средний род
Ермил речка решето
квас пашня шило
лапоть курица долото
печь сено
Chinese dragons are reclusive and known as “water spirits,” unlike the European variety that are clearly terrestrial beings. ... Western dragons often live in lairs or caves in mountains. Western dragons are portrayed as much portlier creatures, with big claws and large, leathery bat-like wings
