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molding is a process in which polymer resins are superheated, compressed in a charger, and then they are injected into a closed mold cavity; it is used to produce plastic moldings with variable wall thicknesses, as well as fine surface detail, such as the exterior panels of buses and trolleys. 1) molding is a process in which polymer resins are superheated, compressed in a charger, and then
they are injected into a closed mold cavity; it is used to produce plastic moldings with variable wall thicknesses, as well as fine surface detail,
such as the exterior panels of buses and trolleysWrong. - "they" is not necessary.
- "such as the exterior....." is misplaced. It should modify "plastic moldings" NOT "surface detail".
2) molding—a process in which superheated polymer resins are compressed in a charger,
then injecting into a closed mold cavity—is used to produce
plastic moldings, such as the exterior panels of buses and trolleys with variable wall thicknesses,
as well as fine surface detail Wrong. - "injecting" is wrong --> Parallelism problem.
- Meaning problem: it seems "moldings" and "surface detail" are parallel --> wrong.
3) molding—a process in which superheated polymer resins compressed in a charger are then injected into a closed mold cavity—
it is used to produce plastic moldings, such as the exterior panels of buses and trolleys, with walls of variable thickness and surfaces of fine detail
Wrong.- "it" is redundant.
4) molding, a process in which superheated polymer resins are compressed in a charger and then injected into a closed mold cavity, is used to produce plastic moldings, such as the exterior panels of buses and trolleys, with variable wall thicknesses and fine surface detail
Correct.5) molding is a process involving the compression of superheated polymer resins in a charger, and then
they are injected into a closed mold cavity; this process, which is used to produce plastic moldings with variable wall thicknesses and fine surface detail,
such as the exterior panels of buses and trolleysWrong. - "they" is redundant.
- "such as exterior...." is misplaced --> it modifies "surface detail" --> wrong.
Hope it helps.