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

2019-11-05View Original

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5. Before shutting down the centrifugal pump, (?????) should be closed first. ?A. Inlet valve?? B. Outlet valve?? C. Inlet and outlet valves. The correct answer to the question from yesterday was: B. 4. Calcium-based lubricants possess (??B???) properties. ?A. Heat resistance??B. Water resistance??C. Heat dissipation?

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