During a routine follow-up examination, the nurse updates the client's medication history. The client currently receives prednisone therapy. Concomitant use of an agent from which of the following classes could increase the risk of peptic ulcer disease ？（）

A．Antidiabetic agents, administered orally.

B．Nonsteroidal anti-inflammatory drugs (NSAIDs).

C．Beta-adrenergic blockers.

D．Contraceptive agents, administered orally.

调制的目的之一是（）。

A.减小接收天线的尺寸

B.减小发射天线的尺寸

C.降低干扰