单项选择题
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? （）
单项选择题 You are approaching another vessel and see that she has the signal flag “J” hoisted. What should you do?（）
单项选择题 With a given load on the cargo hook，the thrust on a cargo boom（）.