Which of the following materials would change temperatures the slowest (under the same conditions)?                                               Air Oil Water None of the above

Which of these statements is the best description of the properties of refractory metals?  Group of answer choices extremely high melting temperature soft, ductile, and oxidation resistant lowest density of all structural metals low density, high electrical and thermal conductivities, and a resistance to corrosion in the ambient atmosphere.

Are nails are considered as direct materials.    True False Can be true, can be false

Other than wood nonferrous engineering materials can be divided into four categories they are polymers elastomers ceramics and glass and composites. True or false.