--- Port five!
----Port five!（）!

单项选择题Duty officer and （）keep navigational watches on the bridge at sea.

A.seaman
B.sailor
C.duty sailor
D.OS

单项选择题---“（）” ---“Two degrees on starboard.”

A. What rudder?
B. How is the heading?
C. How answer?
D. What course?

单项选择题“Port a little sluggish” means（）

A. that the port rudder answers very well.
B. that the port rudder answers slow.
C. that the port rudder answers quickly.
D. that the port rudder is broken.

单项选择题Bow （）(推进器) full to starboard.

A.thrust
B.stern
C.engine
D.speed

单项选择题Keep to the middle of the（）(航道) ！

A.buoy
B.mark
C.beacon
D.channel