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词汇 middle oil
释义

Definition of middle oil in English:

middle oil

noun
  • A fraction that comes off at intermediate temperatures (about 200° to 250°C) in the distillation of coal tar and is rich in naphthalene.

Origin

Late 19th century; earliest use found in Webster's International Dictionary of the English Language.

Definition of middle oil in US English:

middle oil

noun
  • A fraction that comes off at intermediate temperatures (about 200° to 250°C) in the distillation of coal tar and is rich in naphthalene.

Origin

Late 19th century; earliest use found in Webster's International Dictionary of the English Language.

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