单项选择题
Three SHORT BLASTS mean（）.
A.I am altering my course to starboard B.I am altering my course to port C.I am operating astern propulsion D.I am operating ahead propulsion
单项选择题 The winch is liable（）worn-out in this way.
单项选择题 The winch at Hatch No.3 is（）trouble.
单项选择题 The term PROLONGED BLAST refers to（）.
