The answer to this question would be "continuous."
Explanation:
An assembly line is a system in which groups of people work together and work on certain parts of something and combine these parts to make the final product.
An assembly line is a manufacturing process (most of the time called progressive assembly) where parts (commonly interchangeable parts) are added as the semi-finished assembly moves from the workstation to the workstation where the parts are added in sequence until the final assembly occurs. By moving the parts mechanically to the assembly station and moving the semi-finished assembly from station to workstation, a finished product can be assembled much faster and with less work by having workers transporting parts to a stationary part to assemble.
Assembly lines are the most common method of assembling complex parts such as cars and other transport equipment, electronic goods and appliances.
The reason that the wartime alliance between the United States and the Soviet Union unraveled is because the United States was against communism but the Stalin wasn't. All of the land occupied by the Soviet Red Army were controlled by communism and Stalin wanted to spread this into Western Europe and West Berlin.