正常成人PR间期为（）。

A.0.10~0.20秒

B.0.12~0.20秒

C.0.06~0.08秒

D.0.32～0.44秒

E.0.08~0.22秒

You are on watch at sea a man falls overboard on the port side, forward near No. 1 hatch. What of the following should you do first?（）.

A.Call the master

B.Put the helm hard over toward the port side

C.Sound the alarm to arouse all hands

D.Stop the engines