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Conforme al Real Decreto 339/2021, de 18 de mayo, por el que se regula el equipo de seguridad y de prevención de la contaminación de las embarcaciones de recreo:Under Royal Decree 339/2021 on safety and anti-pollution equipment for leisure craft:

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Correct answer: a) Sewage stored in holding tanks is not discharged at once but at a moderate rate, with the boat en route making at least 4 knots.

Why it is correct

The tank empties gradually while making 4 knots or more, so it disperses. All at once is not allowed.

Why the others are not

  • b) It is 4.
  • c) Not at once, not 3.
  • d) Not at once.

How to work it out in the exam

  1. Tank: slowly at 4 knots.

Where this question comes from

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Pending instructor review. Machine translation, not reviewed.