单项选择题
Insufficient space between the hull and bottom in shallow water will prevent normal screw currents resulting in （）.
A.waste of power B.sudden sheering to either side C.sluggish rudder response D.All of the above
单项选择题 Information on the operating times and characteristics of foreign radiobeacons can be found in which publication? （）
单项选择题 If the officer on watch is in any doubt as to the pilot’s actions，or intentions，he should （）.
单项选择题 Gangway （）with pilot ladder on my starboard side．
