SVP Plumber Practice Questions - Saudi Skill Verification Program - Plumber (Saudi Arabia) Exam

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Which of the following gas combinations poses the highest immediate risk of explosion and suffocation when entering an unventilated public sewer manhole?

Methane and Hydrogen Sulfide Oxygen and Nitrogen Carbon Dioxide and Argon Helium and Neon

Correct Answer:

Methane and Hydrogen Sulfide

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