单项选择题
A.You must provide air transportation to the nearest port of entry in the United States
B.You must provide passage to the port of original engagement
C.There is no requirement for return to the United States provided the voyage has exceeded 4 weeks duration
D.The crew can be employed on another United States vessel，but only if it is returning to the port of original engagement
单项选择题 You are loading a cargo that includes cylinders of acetylene aboard your break bulk vessel. Which statement is true? （）
单项选择题 You are loading a cargo tank on your container ship. The tank displays the red label shown. Which statement is TRUE? （）
单项选择题 You are in charge of a towing vessel that operates exclusively on inland waters. You regularly tow barges that provide services (cargo lighters，fuel barges，etc.) to foreign flag vessels in port. What will be accepted as proper credentials for you and your crew? （）