导致阴床出水电导率、碱度超标的原因有（）。

A、阳床失效；

B、进碱门未关严；

C、再生后置换不彻底；

D、阴床失效。

A client on prolonged bed rest has developed a pressure ulcer. The wound shows no signs of healing even though the client has received skin care and has been turned every 2 hours. Which factor is most likely responsible for the failure to heal

A．Inadequate vitamin D intake.

B．Inadequate protein intake.

C．Inadequate massaging of the affected area.

D．Low calcium level.