单项选择题

High pressure and low pressure alarms must be tested（）.

A.no earlier than 24 hours prior to loading
B.no later than 24 hours prior to loading
C.anytime prior to loading
D.weekly

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单项选择题

High clouds，composed of small white flakes or scaly globular masses，and often banded together to form a “mackerel sky”，would be classified as（）.

A.cirrus
B.cirrocumulus
C.altostratus
D.cumulonimbus

单项选择题

Hanging a barge off means to（）.

A.moor a damaged barge to the bank and leave
B.remove and deliver a loaded barge from a multiple tow
C.remove a barge while locking through
D.tow an empty barge astern

单项选择题

Handholds or straps on the underside of an inflatable liferaft are provided（）.

A.to right the raft if it capsizes
B.to carry the raft around on deck
C.for crewmen to hang on to
D.to hang the raft for drying