【单选题】The cabin emergency exits are used for _____.
【单选题】Don’t forget where the emergency exits are _____an emergency.
【简答题】Winter will _____pass, and spring is ____ to come.
【判断题】Emergency exits are located on each side of the aircraft. All the exits are clearly marked.
【单选题】互感器的作用是将系统中的一次高电压或大电流经过互感器,被成比例地转换成为低电压或者小电流,使测量、计量等仪表的量程和量限得到()。