题目内容
The Double Ninth Festival or Chongyang Festival is celebrated on the ninth day of the ninth _________.
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In 1989, the Chinese government designated the Double Ninth Festival as "___________".
The Chongyang festival began as early as the Warring States period.
The number "9" represents the feminine or negative yin, while "6" the masculine or positive yang. So the "9" in both month and day creates the Double Ninth Festival, or Chongyang Festival.
铝盐药物的测定常用络合滴定法。加入过量EDTA,加热煮沸片刻后,再用标准锌溶液滴定。该滴定方式是( )。
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