【简答题】(U6P1) 1. The purpose of the oxygen system is to provide oxygen for the flight crew and passengers when required. 2. Two independent oxygen systems are installed in B737. 3. The flight crew oxygen sys...
【简答题】Listen to the following conversation twice, and then complete the passage according to the conversation you have just heard. A passenger is checking in 1 . He would like to have a window seat. If the...