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One question per day; no prize for correct answers, it’s mainly for entertainment

2019-11-14View Original

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12. When objects soaked in kerosene, gasoline, etc. at the construction site catch fire, ( ) should be used to extinguish the fire. ?A. Water B. Foam extinguishing agent C. Water and foam extinguishing agent. The answer to the question from yesterday was A. 11. If there is a certain amount of end face play in the sealing surface of the rotating ring of a mechanical seal, it will cause (A) phenomenon. A. Leakage B. Shaft burnout. The answer to the question from the day before yesterday was: B

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