第18题: [单项选择]Questions 11 to 18 are based on the conversation you have just heard. A. Turn the music down. B. Find a quiet room. C. Keep the volume high. D. Close the door. 参考答案:C 答案解析:[听力原文] W:Hi,Jack! Turn that music down.I am discussing something with your father. M:That is t
第19题:[单选题] 发动机发电机向飞机电网供电时,外电源使用灯亮说明什么 A. - 外部地面电源车正向AC BUS1和AC BUS2供电 B. - EPC被闭和 C. - 外部地面电源车正向交/直流地面勤务汇流条供电。 D. - 外电源一定在使用中 参考答案:B