单选题While underway and towing an unmanned tank barge you are required to（）.Amaintain a strict watch on the barge from the towing vesselBfly a red flag from the towing vesselCopen the tops of all empty tanks on the bargeDtake hourly soundings of any loaded tanks on the barge
单选题
While underway and towing an unmanned tank barge you are required to（）.
A
maintain a strict watch on the barge from the towing vessel
B
fly a red flag from the towing vessel
C
open the tops of all empty tanks on the barge
D
take hourly soundings of any loaded tanks on the barge
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