Which of the following are advantages of using a flow restrictor to control the delivery of medi-cal gases to a patient? 1. Preset metered flow 2. Low cost and simplicity 3. Gravity independence 4. Wide range of utility
a. 1, 2, and 3 only
b. 1, 2, and 4 only
c. 2 and 4 only
d. 3 and 4 only
ANS: A
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