Multiple choice Choose the correct pair. Helium Nitrogen gas mixture - Artificial respiration for sea-divers Menganese bronze - Air-Craft building Thallium Bro-mide Crystals - Transmit Infrared radiation Platinum - Dental Filling Reveal answer Fill a bubble to check yourself B Correct answer Explanation Manganese bronze is a type of brass used in marine engineering and aircraft building due to its strength and corrosion resistance. Other options are incorrect or imprecise.