前列腺增生症病人发生急性尿潴留，应首先()

A．膀胱穿刺

B．导尿并留置导尿管

C．金属导尿管导尿

D．膀胱造瘘术

E．导尿后拔除尿管

What is NOT a distress signal?（）.

A.Red flares or red rockets

B.Continuous sounding of fog signaling apparatus

C.International Code Flags November and Charlie

D.Basket hanging in the rigging