It is useful to know that each journal publishes a topical index at the end of a ________ cycle, although this cycle may not correlate exactly to a calendar year.

The propagation of radiant energy will be most efficient when the radiation source is positioned at a ________ angle to the target tissue

A) 45° B) 75° C) 60° D) 90°

The standard for air exchange in the operating room is a minimum of ________ and a maximum of ________ filtered air exchanges per hour

A. 15; 20 B. 25; 30 C. 40; 50 D. 5; 10