单项选择题
A lifeboat is weight tested by lowering to near the waterand loading to capacity with weight evenly distributed. Itis then lowered into the water and released. This test mustbe done at least once every（）.
A.6 months B.12 months C.18 months D.24 months
单项选择题 A fully loaded motor-propelled lifeboat must be capable of attaining a speed of at least（）.
单项选择题 A certificated lifeboatman assigned to command the lifeboat should（）.
单项选择题 When in command of a lifeboat under oars，the command TOSS OARS means to（）.
