The Master of a cargo or tanker shall be responsible that each lifeboat，except those free-fall launched，is lowered to the water with crew and maneuvered at least once every（）.
举一反三
- 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（）.
- The total weight of cargo，fuel，water，stores，passengers and crew，and their effects，that a ship can carry，is the（）.
- Which（）need NOT be entered in the Official Logbook? A: The testing of the internal combustion engine driven emergency generators at least once each month the vessel is navigated B: The testing of storage batteries for emergency lighting and power systems once each 6 months the vessel is navigated C: The actual draft when the vessel arrives in salt water after departing a port D: The testing of the line-throwing appliance once every 3 month
- Every radio installation shall be protected against（ ）extremes of temperature and other adverseenvironmental conditions. A: coated oil B: dangerous cargo C: harmful effects of water D: noxious atmosphere
- Ballast water can only be（）in cargo tanks in exceptional cases where the particular character of the operation of an oil tanker renders it necessary to carry ballast water in excess of the quantity required，provided that such operation of the oil tanker falls under the category of exceptional cases as established by the Organization.