см. в … применяется ; на … применялись ; применяется при решении задач ; син. использоваться ; находить применение ; употребляться
Liquefied ammonia is used as a fuel for liquid-propellant engines in combination with LOX…
Since 1957, use has been made of electronic and other instruments…
This method has not been thoroughly studied as yet, and is rarely employed .
The following types of ground station antennas are in general use : …