单选题As a vessel sinks to a depth of 15 feet，the hydrostatic trip releases the liferaft container from its cradle by（）.A breaking the weak linkB releasing the tie-down strapC pulling the operating cordD releasing the CO2 canister

A channel is started as having a controlling depth of 38 feet. Which statement is TRUE?_____

A.At least 80% of the channel is cleared to the charted depth.

B.At least 50% of the channel is cleared to the charted depth.

C.100% of the channel depth is clear to 38 feet.

D.The sides of the channel conform to at least 50% of the controlling depth.

As a vessel sinks to a depth of 15 feet, the hydrostatic tip releases the life raft container from its cradle by ______.

A.breaking the weak link

B.releasing the tie-down strap

C.pulling the operating cord

D.releasing the CO2 canister

25． Which of the following is WRONG?

A． One animal finds something to eat， and it may be eaten by others

B． At the depth of 3，000 feet under the sea， many animals can find their way by hearing and feeling．

C． The deeper the sea is， the darker and colder it is．

D． At the depth of 3，000 feet under the sea， all animals can find their way by see-ing．

A hydrostatic release mechanism for a liferaft ______.

A.must be wet before it will release

B.should be kept in a watertight cover except in an emergency

C.will inflate the raft in its cradle if operated manually

D.must be submerged to a certain depth to release automatically

For a floating vessel, the center of flotation is the point in the waterplane ______.

A.about which the vessel lists and trims

B.which coincides with the center of buoyancy

C.which, in the absence of external forces, is always vertically aligned with the center of gravity

D.which is shown in the hydrostatic tables as VCB

The Emergency Position Indicating Radiobeacon on a cargo vessel must be stowed ______.

A.in an inside passageway

B.in an approved bracket

C.so that it is accessible from the bridge of the vessel

D.so that it will float free if the vessel sinks