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etch Quiz

EN[-ɛtʃ]
    Choose the most appropriate answer for each question.
  • Question 1 :
  • Even though no obvious staining was observed in our case, contact with the vapor was still found to perform very faint _______ at a submicrometric scale.
    1. etching
    2. etches
    3. etched
    4. etch
  • Question 2 :
  • a powderless _______ ‎
    1. etching
    2. etches
    3. etched
    4. etch
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Source: Wiktionary
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Difficultness: Level 7
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Easy     ➨     Difficult
Definiteness: Level 3
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Definite    ➨     Versatile
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