Answer:
Object.
Explanation:
Visual aids are the mediums used alongside verbal descriptions to help in better understanding. Visual aids can be in different forms like graphs, video clips, charts, photographs, etc.
In the given scenario, the air conditioning manufacturing plant manager's desire to train the service installers will be best aided by the use of objects. This s because using objects will enable the trainees to be familiar with the parts and steps required for a successful installation.
Thus, the correct answer is an object.
•He was a man of principle and good to his word.
•All internal combustion engines work on the same principles.
•The ambassador refused on principle to agree to the terms of the accord.
There exist certain fundamental principles of human rights.
“two households, both alike in common dignity (In fair Verona, where we lay out scene) From ancient grudge break to new mutiny Where civil blood makes civil hands unclean.” (Prologue 1-4)
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