One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； June 30

2016-06-30View Original

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Multiple-choice question: A type of pump that relies on working elements such as pistons, plungers, diaphragms, gears, or blades to carry out reciprocating or rotational movements within the pump chamber, thereby causing the volume of several working chambers in the pump to change periodically and allowing liquid to be drawn in and discharged alternately. The positive displacement pumps among the following are: ( ) A. Piston pump B. Gear pump C. Screw pump D. Water ring vacuum pump Answer: ABCD

Reply #22016-06-30

A. Piston pump B. Gear pump C. Screw pump D. Water ring vacuum pump

Reply #32016-06-30

A. Piston pump B. Gear pump C. Screw pump

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One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； June 30

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