A client with cholecystitis is receiving propantheline bromide. The client is given this medication because it （）.

A．reduces gastric solution production and hypermobility.

B．slows emptying of the stomach and reduces chyme in the duodenum.

C．inhibits contraction of the bile duct and gallbladder.

D．decreases bile secretions.

光功率计可用于（）等参数的测量。

A.接收机过载功率 

B.接收机灵敏度 

C.信噪比 

D.光通道衰减