Help on these questions please

rheumatism and the time-limit that a man could work in the chilling-rooms was said to be five years.

germany

explanation:

a rocket engine utilizes collected rocket explosive mass for producing its high-speed propulsive jet. rocket engines are effect engines, achieving thrust in accordance with newton's third law. maximum rocket engines use flaming, although non-combusting methods (such as cold gas thrusters) also exist.