When administering artificial respiration to an adult, the breathing cycle should be repeated about （）<br>A:12 to 15 times per minute<br>B:18 to 20 times per minute<br>C:20 to 25 times per minute<br>D:as fast as possible

When administering artificial respiration to an adult, the breathing cycle should be repeated about （）
A:12 to 15 times per minute
B:18 to 20 times per minute
C:20 to 25 times per minute
D:as fast as possible

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