• 2022-06-06
    In
    the acid-base titration of aspirin, neutral ethanol is required to be
    used as the solvent. What is the meaning of calling "neutral"?()
    A: neutral
    to the indicator used
    B: pH=7
    C: ethanol
    to remove acidic impurities
    D: It
    is neutral to methyl orange
    E: relative
    to the tested substance
  • A

    内容

    • 0

      Dick()in<br/>America,but<br/>he has been used to eating Chinese<br/>food since he moved to China. A: used<br/>to live B: is<br/>used to live C: is<br/>used to live D: used<br/>to living

    • 1

      Which<br/>of following is the best choice for storage of extracted DNA<br/>sample:____ A: ultrapure<br/>water B: TE<br/>buffer C: 75%<br/>ethanol D: TBE<br/>buffer

    • 2

      (<br/>)<br/>When a phrase is shortened to one word which maintains the meaning<br/>of the whole, e.g. GOLD is used for GOLD METAL, the meaning of that<br/>word changes.

    • 3

      There are 4 main factors that control mandibular movements, except<br/>for: () A: bilateral temporomandibular joints B: the occlusal contact relationship of the teeth C: blood supply D: neutral structure E: muscle structure

    • 4

      The neutral culture in the emotional expression refers to a culture that recognizes neutral images.