第8题: [单项选择]Questions 22 to 25 are based on the conversation you have just heard. A. The address. B. The passport number. C. The date of departure. D. The signature. 参考答案:C 答案解析:[听力原文] What did the man forget to fill in the form
第19题: [单项选择]一台并励直流发电机额定数据为:PN=35kW,UN=115V,nN=1450r/min,电枢绕组电阻ra=0.0243Ω,一对电刷压降2△U=2V,励磁回路电阻Rf=20.1Ω,该发电机额定运行时的电磁转矩为(
)N·m。 A. (A) 255.5 B. (B) 253.7 C. (C) 249.4 D. (D) 254.2 参考答案:D