What questions in particle physics led to the necessity for the development of the quark theory? what were the deficiencies in the older theories that made it necessary to formulate a theory of particle structure on a level below (i. e., smaller than) that of electrons, protons, and neutrons? what observational evidence is there for the existence of smaller particles within the proton, for example?

nec chapter 5 contains

c. information on special occupancy areas

nec chapter 6 covers

a. special equipment

which of the following rules contain the words shall or shall not and must be adhered to?

b. mandatory rules

which of the following rules identify actions that are allowed but not required and typically cover options or alternative methods?

c. optional rules

which of the following serves as the introduction to the nec and provides an overview of the book?

a. nec article 90

organizations that test products for safety are

c. nrtls

the nec is published by the

a national fire protection association

the nec is divided into

b. 9 chapters

the nec provides informative annexes for

c. informational materials and examples

two terms from nec article 100 that trainees should become familiar with are

b. labeled and listed

explanation:

chemical properties of thing

i would say