单项选择题

It can be interred from the article that an inertial guidance system is similar to

A．a gyroscope.
B．a high speed vehicle.
C．a navigator.
D．a submarine.
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单项选择题
According to the selection, the basic concern of the inertial guidance system is
A．space in three dimensions.
B．poor visibility and meteorological conditions.
C．the altitude and position of a vehicle.
D．spacecraft productivity.
单项选择题
Spaceships need an inertial guidance system, but automobiles do not because of
A．the relative speed of the vehicles.
B．the relative size of the vehicles.
C．the relative cost of the vehicles.
D．their different methods of travel.
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