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

2019-11-21View Original

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19. The gas pressure entering the primary cylinder of the air compressor is () atmospheres. ?A. Lower than B. Equal to? C. Greater than? The answer to the question from the day before yesterday was: B. 17. Before starting a centrifugal pump, it is necessary to fill the pump with liquid and close (B) to prevent backflow. ?A、Inlet valve??B、Outlet valve??C、Inlet and outlet valves?

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