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157 gears are most commonly manufactured from (). A. Medium carbon steel B. Gray cast iron C. Cast bronze. Answer to question 151 as of April 1, 2020: AC. Compared to a frame level, a combined level has (A) and (C). A. Large measurement range B. Good versatility C. High precision. B. April 2, 2020. Answer: A. In a self-reflecting level, the offset of the image is determined by the angle of rotation of the mirror, and it is unrelated to the distance from the mirror to the objective lens (A). A. Related to distance B. Unrelated to distance C. Related to angle. Answer to question 153 on April 3, 2020: B. The rotor has a series of natural frequencies such as the first-order, second-order, etc., among which is the first-order critical speed (B). A. Highest B. Lowest C. Medium Answer to question 154 on April 4, 2020: A. 154. When the rotor speed increases to a certain value, the vibration’s ( ) always lags behind the ( ) by a certain phase angle. A. High point B. Low point C. Key point. Answer to question 155 on April 5, 2020: B. 155. In assembly drawings, when drawing holes or thin sections with a diameter or thickness of less than 2 mm, as well as when representing small degrees of taper or slope, it is allowed to depict such elements without maintaining proportion (B). A. Reduce B. Exaggerate C. Arbitrary. Answer to question 156 on April 6, 2020: C. 156. Enterprises have the task of complying with corresponding standards every (C). A. Leaders and managers B. Engineers C. Employees (Answers will be released the day before they are announced; those who get it right before the announcement receive 10 wealth points, those who get it right after the announcement receive 5 wealth points, and those who participate receive 3 wealth points.) I’ve been a bit busy lately, so it’s taking some time to post questions and provide feedback on scores. But no matter how busy or late it gets, I will still post things and respond to everyone. Thank you all for your continued support