单项选择题
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
High clouds，composed of small white flakes or scaly glo...
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
Hanging a barge off means to（）.A.moor a damaged barge t...
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
Handholds or straps on the underside of an inflatable l...
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
