【单选题】在Engineering village(EI)数据库中检索植物精油(essential oil(s))胶囊化(capsule(s))技术,检索结果最少的是:
A.
("essential oil" and capsul*) wn ab
B.
("essential oil" and capsul*) wn ti
C.
("essential oil" and ( capsul* or encapsul*) wn ab
D.
("essential oil" and ( capsul* or encapsul*) wn ti