第9题:[单选题]There are two flight guidance modes, namely managed guidance and selected guidance. Which one of them has the priority? A. Selected guidance B. Managed guidance C. They are of the same priority 参考答案:A
第10题: [单项选择]常用低压三相交流电动机电压为()。 A. 180V B. 220V C. 380V D. 6000V 参考答案:C