一般在百米竞赛的预备信号之后，仅间隔2—3秒就发出起跑信号，是为了避免运动员受（ ）的影响

(单选题)如果学生对于问题里面的某个问不知道或不理解会影响学生对问题的反应。例如一个教师说：“Can you elaborate (单选题)The best title for this passage may be ______. (单选题)As for the details of the system designed by researchers, wh (单选题)As for the characteristics of the energy management system, (单选题)Which of the following statements is INCORRECT about hybrids (单选题)The underlined word “chauffeuring” in the passage is closest (单选题)All following factors contributed to the drop of the resourc (单选题)Which of the following statements about source-rich economie (单选题)What political problem exists in mining industry? (单选题)According to the passage, mining is different from other ind