细菌菌落数总数检查，采样后必须尽快对样品进行相应指标检测，送检时间（）。

A.不得超过6小时，若样品于0～4℃保存，送检时间不得超过24小时

B.不得超过12小时，若样品于0～4℃保存，送检时间不得超过24小时

C.不得超过4小时，若样品于0～4℃保存，送检时间不得超过12小时

D.不得超过6小时，若样品于0～4℃保存，送检时间不得超过12小时

E.不得超过4小时，若样品于0～4℃保存，送检时间不得超过24小时

The nurse teaches a client about the relationship between body position and gastroesophageal reflux. Which of the following statements by the client would indicate that he understands measures to avoid problems with reflux while sleeping()

A. "I can elevate the head of the bed 4 to 6 inches. "

B. "I can elevate the foot of the bed 4 to 6 inches. "

C. "I can sleep on my back without a pillow under my head. "

D. "I can sleep on my stomach with my head turned to the left. \