單項(xiàng)選擇題Deck foam systems，designed to protect cargo areas on tankers built after January 1，1975，must have a supply of foam-producing material to operate the system at its designed rate of foam production for（）.

A.15 minutes without recharging
B.20 minutes without recharging
C.25 minutes without recharging
D.30 minutes without recharging


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1.單項(xiàng)選擇題Cable tension for catenary calculations is taken at the（）.

A.chain locker
B.fairlead
C.anchor
D.contact point of chain with seabed

2.單項(xiàng)選擇題By regulation，life preservers aboard an uninspected towing vessel must be（）.

A.readily accessible
B.securely stowed
C.stored in sealed containers
D.stowed with the emergency provisions

4.單項(xiàng)選擇題An oxygen indicator can be used to determine if there is（）.

A.sufficient oxygen in a compartment to support life
B.combustible gases present
C.hydrogen gas present
D.All of the above

5.單項(xiàng)選擇題An on-load release system on a survival craft means the cable can be released（）.

A.only when the load is taken off the cable
B.only when there is a load on the cable
C.only when activated by the controls at the lowering station
D.at any time