单项选择题
You are cleaning the tanks after carrying a cargo of crude oil. Which statement is TRUE? （）
A.Washing water should be recirculated if possible because it has the same electric potential as the cargo tank being cleaned
B.The hoses to portable cleaning machines should be disconnected before the machines are removed from the tank
C.The principal hazard with steaming cargo tanks is raising the ambient temperature above the flame point of the cargo residue
D.Steam cleaning and water washing are both capable of generating electrostatic charges within a tank
相关考题
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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? （）
A.Isoprene may be carried in a cargo tank adjacent to either of the other two cargoes
B.Methyl methacrylate may not be carried in a tank adjacent to a pump room
C.Methyl methacrylate must usually be heated to maintain its stability
D.Portable thermometers are not permitted to be used to take the cargo temperature of triethylamine -
单项选择题
You are carrying cargoes of crotonaldehyde，phosphoric acid，and morpholine on your multiple-product tanker. Which of the following statements is TRUE? （）
A.Each of the cargoes must be segregated from the other by at least two barriers
B.The minimum protective clothing required for taking samples of phosphoric acid is goggles or a face shield
C.Aluminum，copper，and zinc are prohibited in all valve parts in contact with these cargoes
D.The required warning sign must have the legend "cancer hazard" added to it -
单项选择题
You are approaching another vessel and see that she has the signal flag “J” hoisted. What should you do?（）
A.Keep well clear of the vessel because she is on fire and has dangerous cargo on board or she is leaking dangerous cargo
B.Attempt to call the vessel on VHF radiotelephone because she is requesting to communicate
C.Approach the vessel with caution because she is dragging her anchor
D.Proceed on present course and speed since the vessel is requesting a tug
