Which of the following words consists of four parallel metal rods.

Which of the following words means "having a valence of one"?

Which of the following words means "a division or contrast between two things that are entirely different."

Which of the following words means "a decision that affects one group, without the agreement of another or the others."

A kilohertz is a unit of frequency equal to _____________hertz.

A milliroentgen has one _______________

of a roentgen.

Which of the following is a monocle?

Which of the following is are trifocals?

Which of the following words means "made of a single piece of stone."