【名词&注释】
润滑油(lubricating oil)、代表性(representative)、成型机(forming machine)、保温层(insulating layer)、热壁反应器(hot wall reactor)、加氢精制催化剂(hydrofining catalyst)、结果表明(the results showed that)、大多数(most)、4-苯并芘(4-benzopyrene)
[单选题]常用加氢精制催化剂的金属组分是Co-Mo、Ni-Mo、Ni-W、Co-W或Mo-Co-Ni,有关研究结果表明(the results showed that),上述金属组分的加氢活性顺序为()
A. A、Ni-W<Ni-Mo<Co-Mo<Co-W
B. B、Ni-W>Ni-Mo>Co-Mo>Co-W
C. C、Ni-W<Co-W<Co-Mo<Ni-Mo
D. D、Co-W>Ni-Mo>Co-Mo>Ni-W