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This post was last edited by 156026692 on 2019-9-15 at 10:13. Rules for the true/false questions: 1. If both questions are answered incorrectly, +2 wealth is awarded for active participation; if one question is answered incorrectly and the other correctly, +4 wealth is given; if both questions are answered correctly, +6 wealth is awarded. 2. If only one answer is provided, unless it is clear which question’s answer it is, a correct answer earns +4 wealth points, while an incorrect answer earns +2 wealth points; in all other cases, it is counted as active participation and grants +2 wealth points. 3. Rewards for answers are available once per person only. 4. Each reply allows scoring for only one person. 5. The answer and its explanation will be visible after responding. 6. The reward is valid for 48 hours; no reward will be given after that period. 7. Posts that have been edited will receive only +2 wealth points. Learn more and win prizes; come by here every day. 1. Using a single-spring mechanical seal in high-speed applications is more stable than using a multi-spring mechanical seal. ( ) 2. A rigid rotor refers to a rotor whose operating speed is (high) than the first critical speed ； Rigid rotors are usually subjected to (high-speed) dynamic balancing checks. ( ) Answer: Incorrect (using a multi-spring mechanical seal in high-speed applications provides greater stability than using a single-spring mechanical seal) ； Error (A rigid rotor refers to a rotor whose operating speed is below the first critical speed) ； Usually, rigid rotors are subjected to low-speed dynamic balancing checks. I’ve been so busy working overtime during the recent holidays that I couldn’t keep up with my tasks for a few days; wish everyone a happy last day of the Mid-Autumn Festival holiday! ~