第16题: [单项选择]{{I}}Questions 14~17 are based on the following dialogue.{{/I}}According to the travel agent, how long should the traveler book the trip in advance A. Six to eight months. B. Seven to eight months. C. Seven to eight weeks. D. Six to eight weeks. 参考答案:D
第32题: [单项选择]溶解于植物油中可形成典型的触变胶是() A. 甘油 B. 阿拉伯胶 C. 甲基纤维素 D. 硅皂土 E. 单硬脂酸铝 参考答案:E 答案解析:助悬剂是为了提高混悬剂的稳定性所加入的稳定剂之一。包括低分子助悬剂(如甘油、糖浆剂等)。高分子分为天然高分子助悬剂(如阿拉伯胶、西黄蓍胶、桃胶等)、合成或半合成高分子助悬剂(如纤维素类、甲基纤维素钠、