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In the process of nasogastric tube insertion, if Mr. Li appears choking cough, dyspna, what measures should the nurse take? ( )
A.
Ask Mr. Li to take a deep breath.
B.
Hold up Mr. Li’s head, continue advancing the tube.
C.
Ask Mr. Li to swallow the tube.
D.
Pull out the tube immediately , insert it again after a short time rest.