______ is recognized as the national flag-carrier.
A. The private airline
B. The public airline
C. The chartered airline
D. jet airline
I _____ the party much more if there hadn’t been quite such a crowd of people there.
A. would enjoy
B. will have enjoyed
C. could have enjoyed
D. will be enjoying
伺服电动机在自动控制系统中作用是()
A. 反馈元件
B. 放大元件
C. 执行元件
In Europe _______ are the two leading contenders for a global reservations system.
A. SABRE and GALILEO
B. GALILEO and APOLLO
C. GALILEO and AMADEUS
D. APOLLO and AMADEUS