In which type of foam system is foam discharge piping in place but not attached to a permanent foam source?

Spalling of a brick or concrete wall could be an indicator of which of the following?

A) Sustained heat B) Poor construction technique C) Chemical damage D) Inadequate rebar reinforcement

Who has sufficient skill, knowledge, or experience in a given field so as to be capable of drawing inferences or reaching conclusions or opinions that an average person would not be competent to reach?

A) An expert witness B) A fact witness C) A hostile witness D) A reluctant witness