The client is to receive an IV infusion of 3000 mL of dextrose and normal saline solution over 24 hours. The nurse observes that the rate is 150mL/hour. If the solution runs continuously at this rate, the infusion will be completed in

A. 12 hours.
B. 20 hours.
C. 24 hours.
D. 50 hours.

爆破后必须经过（）通风排烟后，检查人员方可进人工作面，检查有无“盲炮”及可疑现象。

A.5min

B.7min

C.lOmin

D.15min