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造成乳剂破裂的原因（）

【参考答案】

A、分散相与连续相存在密度差
B、乳化剂失去乳化作用
C、ξ电位降低
D、微生物及光、热、空气等......

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Read the following groups of sentences and rearrange them to form coherent Paragraphs：Paragraph One1. Later on, people began to write on pieces of leather, which were rolled into scrolls.2. In the earliest times, people carved or painted messages on rocks.3. In the middle Ages, heavy paper called parchment was used for writing; books were laboriously copied by hand.4. With the invention of the printing press in the middle of the fifteenth century, the modern printing industry was born.5. Some form of written communication has been used throughout the centuries.
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下面不属于混悬剂的稳定剂的为（）。
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