
speaking 1(7.24)
Authored by phuong ha
English
University

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30 questions
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1.
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30 sec • 1 pt
Water purification device
2.
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30 sec • 1 pt
Portable, tube-shaped water filter
3.
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30 sec • 1 pt
Designed for outdoor and emergency use
4.
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30 sec • 1 pt
Hollow fiber membrane
5.
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30 sec • 1 pt
Contaminants such as bacteria and single-celled organisms
6.
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30 sec • 1 pt
Operates without batteries or a power source
7.
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30 sec • 1 pt
Relying instead on the user's suction
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