【单选题】Which of the following statements is NOT the characteristics of the United States' aircraft launching some satellites?
A.
This method still needs a rocket-powered launch vehicle.
B.
The vehicle can pay no attention to friction with the thick atmosphere.
C.
Much more fuel is needed.
D.
Only smaller satellites can be launched this way.
【单选题】The Instrument Landing System (ILS) is a ground-based instrument approach system which provides -------- guidance to an aircraf
【单选题】From the 1960s, international terrorist crimes, such as the hijacking of passenger aircraft, political assassinations and kidnappings, and urban bombings, constituted a growing phenomenon of increasin...
A.
some Marxist organizations
B.
millenarian revolutionary movements
C.
nationalist movements of particular religious focus
D.
heads of state and members of governments
【单选题】最早载录《古诗十九首》的古代典籍是( )
【单选题】The 850 British Airways ______flew from Houston to London at its usual time.