單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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

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

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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（）.

Hanging a barge off means to（）.

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