The captain of a ship can be also called （） .

单项选择题---What is your rudder? ---（）.

A.20°
B.20° starboard
C.Yes，sir
D.Sorry

单项选择题---Ease helm. ---Ease helm. （）.

A. Wheel midship
B. Course 20°
C. Steady
D. Port ten

单项选择题--- Are you on your course? ---Reply: （）!

A. No, 2 degrees port off course
B. Course 020 degrees
C. Steady
D.OK

单项选择题---Are you on your course? ---Reply: （）!

A. Course 040 degrees
B. Yes, right on the course
C. Steady on the course
D. Yes

单项选择题How is the ship heading?（）

A. Port fifteen.
B. Starboard ten.
C. Course 240 degrees.
D. OK.