useful and harmfull
useful
lumber Ex.cutting wood for chairs
harmfull ex.denude forest
1facemask
2tractor
3cans and plastics
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useful and harmfull
useful
lumber Ex.cutting wood for chairs
harmfull ex.denude forest
1facemask
2tractor
3cans and plastics
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face masks; are classified as half masks. Their use is required to prevent the entry of pathogens through the airway and have the role of protecting both the wearer and the people. They are different from medical , and from masks for everyday use. s and self-made masks are not and do not provide complete respiratory protection since air can escape through them.
tractor; their engine conditions from economical and ecological point of view. Overlooked results presented in literature have a straight relation with reduction of tractor fuel consumption and unfriendly impact on the for work environments where there
cans and plastic;
can recycle and use to pot.
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Explanation: