The nurse is caring for a comatose client who has suffered a closed head injury. What intervention should the nurse implement to prevent increases in intracranial pressure (ICP)

A. Suction the airway every hour and as needed.
B. Elevate the head of the bed 15 to 30 degrees.
C. Turn the client and change his position every 2 hours.
D. Maintain a well-lit room.

3G增值业务计费原则中的包月模式，使用时间按何种方式计算（）

A.自然月

B.30天

C.定购时间至下月同一时间

D.31天