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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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
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A.to right the raft if it capsizes
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