Question

Which of the following is typically part of the knowledge base of research and development scientists working on heating devices?(1 point)
Responses

sales projections
sales projections

engineering rules and principles
engineering rules and principles

substances and their properties
substances and their properties

marketing strategies
marketing strategies

Answer 1

The option that is typically part of the knowledge base of research and development scientists working on heating devices is:

**engineering rules and principles**

Additionally, **substances and their properties** may also be relevant, as understanding the materials used in heating devices is crucial. However, the most direct and essential knowledge base for R&D scientists in this field is engineering rules and principles.