[问答题] 简述平版印刷中，油墨的乳化不可避免的原因。

所谓公共危机，是指那些突然发生的、攸关社会利益的、对于部分组织存在与发展具有重大影响的、急需管理者快速应对的事件。 写出充当下列音节的韵头和韵腹的元音。 ①juan ②zhun ③yang ④xue ⑤qiu 某商品的100件样品中，测得的优质品为98件，则样本优质品成数为（） ["无法计算","98%","100%","2%"] Which of the following statements is NOT true?（） ["In the 13th century a Black Rod went between the two Houses of Parliament for liaison and to discipline the members.","In the 13th century Parliament only met by royal invitation.","In the 13th century Parliament's role was to offer advice,not to make decisions.","In the 13th century the most important part of Parliament was the House of Lords."] 简述平版印刷中，油墨的乳化不可避免的原因。