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