单项选择题
A.No credentials are required since you operate on inland waters only
B.Social Security card
C.State driver's license with photo ID
D.Merchant Mariner's Document
单项选择题 You are discharging cargo and the inert gas system is in operation to inert the tanks. The pressure in a tank being discharged starts to drop below the allowable limit. What action should you take? （）
单项选择题 You are cleaning the tanks after carrying a cargo of crude oil. Which statement is TRUE? （）
单项选择题 You are carrying triethylamine，methyl methacrylate and isoprene in your multiple-product tanker. Which of the following statements is true? （）