水利建设市场主体不良行为记录的公告应坚持（）原则 ["准确、公开、及时","公平、公正、客观","准确、及时、客观","准确、公正、客观"]
按GB5071-1996《液压电梯》规定，限速切断阀的动作速度应小于轿厢下行额定速度υd的倍，但不得大于（）（用米每秒）表示。 ["1.25；υd+0.3","1.25；υd+0.5","1.4；υd+0.5","1.5；υd+0.3"]
低速，低压缩比，小功率发动机应选用（）火花塞. ["冷型","热型","中型","都可以"]
Which three technologies are used to reduce chromatic dispersion accumulation in fiber-optic transmission systems？（） [" PIN photodiodes"," zero-chirped lasers"," Erbium-doped fiber amplifiers"," dispersion compensating fiber"," dispersion compensating Bragg grating"]
如何正确合理地使用化学消油剂？
游戏形式
