单项选择题
A.the names of crew members who participated in the drill
B.the length of time that each motor propelled lifeboat was operated in the drill
C.the length of time the lifeboat was in the water
D.the time it took to lower the boat
单项选择题 According to the Code of Federal Regulations，on vessels other than river ferryboats and river vessels，how are periodic lifeboat weight tests required to be conducted?（）
单项选择题 A self-righting survival craft will return to an upright position provided that all personnel（）.
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（）.