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
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