According to the 2005 ATS-ERS guidelines for diffusing capacity,what is the recommended breath-hold time?
A) 9-11 seconds
B) 8-12 seconds
C) 10 seconds $\pm$ 1 second
D) 10 seconds

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The Answer of According to the 2005 ATS-ERS guidelines for diffusing capacity,what is the recommended breath-hold time?
A) 9-11 seconds
B) 8-12 seconds
C) 10 seconds $\pm$ 1 second
D) 10 seconds

According to the 2005 ATS-ERS Guidelines for Diffusing Capacity,what Is ±\pm±

According to the 2005 ATS-ERS Guidelines for Diffusing Capacity,what Is $\pm$