脉搏血氧饱和度测量原理是氧合血红蛋白对哪类波长的红外线吸收量大（）

A.660nm

B.760nm

C.940nm

D.880nm

E.600nm

A client has a nasogastric tube inserted at the time of abdominal perineal resection with permanent colostomy. This tube will most likely be removed when the client demonstrates which of the following

A．Absence of nausea and vomiting.

B．Absence of stomach drainage for 24 hours.

C．Passage of mucus from the rectum.

D．Passage of flatus and feces from the colostomy.