the propulsive matter is caused to flow around the propelled body

propulsive matter is ejected from within the propelled body

its functioning does not depend on presence of air

all of the above

gases

solids

liquid

highly heated atmospheric air.

is self-operating at zero flight speed

is not self-operating at zero^flight speed

requires no air for its operation

produces a jet consisting of plasma

turbo-jet engine

ram-jet engine

propellers

rockets

a propeller system

gas-turbine engine equipped with a propulsive nozzle and diffuse*

chemical rocket regine

ram-jet engine