Thread Content
This post was last edited by 3983596_FPPZ on 2019-1-21 08:58. Rules for the bg2.png multiple-choice 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. Studying* and winning awards again; come by here every day. 1. In the chemical composition of steel, excessive levels of sulfur, phosphorus, and carbon can have harmful effects on the steel; therefore, their levels should be as low as possible ( ). 2. There is an optimal range for the number of blades in a centrifugal pump’s impeller; too many or too few blades will result in suboptimal hydraulic performance ( ). Answers: 1. False (lower levels of sulfur and phosphorus are desirable, but the carbon content should fall within a certain range; exceeding that range results in a different type of steel) ； 2. Correct