pH的测量原理：在25℃时，每相差一个pH值单位就产生59.1V的电池电动势
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Under normal circumstances, the introduction should comprise about 10-20 percent of a speech.
互联网金融营销主体和营销风险控制系统是制定互联网金融营销战略和策略的基础，是互联网金融营销者把握市场机会、规避市场风险的主要工具。
Quotations or paraphrases used to support a point are called __________.
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