单选题How must each storage tank for helicopter fuel on a ship be marked?（）A DANGER - KEEP AWAYB DANGER - EXPLOSIVE VAPORSC DANGER - NO SMOKINGD DANGER - FLAMMABLE LIQUID

What is NOT a requirement for the preparation of used，gasoline-propelled cars if they are to be carried as ordinary cargo and not as hazardous cargo ________．

A.The engine must be run until it dies from lack of fuel

B.The fuel tank must be inerted with CO2

C.The ignition key may not be in the ignition

D.The vehicle must be inspected for fuel leaks

______ of the following statements is（are）correct regarding motor lifeboats on cargo vessels．① The motor of each lifeboat shall be operated in the ahead and astern position for a period of not more than 5 minutes once in each week；② The fuel tank of all motor-propelled lifeboats shall be emptied and the fuel changed at least once in every year．

A.① only

B.② only

C.Both ① and ②

D.Neither ① nor ②

Which statement is TRUE concerning protection of double bottom tanks against excessive pressure?

A.Each vent for the tank must be equal to the area of the tank filling line

B.The tanks must be protected by overflows

C.The total area of the vents or the overflow shall be at least equal to the area of the fill line

D.There must be twice as much vent area as the area of the fill line

Gasoline fuel tank vents should terminate ______．

A.In the engine compartment

B.In the fuel tank space

C.Above or outside the hull

D.At the most convenient location

A ship which is required to carry an Oil Record Book must log in the book ______.

A.discharge of ballast or cleaning water from fuel tanks

B.sounding levels of all fuel tanks on a daily basis

C.the grade and specific gravity of all fuel oil carried

D.fuel consumption rates on a weekly basis