表面活性剂的应用不包括
A. 乳化剂
B. 润湿剂
C. 增溶剂
D. 催化剂
E. 去污剂
Why sharks are useful for humans.* A. Their tasty meat. B. The principle of their defense system against disease. G. Their solid skin. D. The principle of their birth modes.
A. Their solid skin.
B. The principle of their birth modes.
C. The principle of their defense system against disease.
D. Why sharks are useful for humans.*
E. Their tasty meat.
What prompted the conversation
A. The man wants to place a classified ad in the newspaper.
B. The woman wants to find an apartment.
C. The man wants to pay for a newspaper subscription.
D. The woman wants to fill out an application for employment.
疏水胶体的性质中不正确的是
A. 存在强烈的布朗运动
B. 具有双分子层
C. 具有聚结不稳定性
D. 不能形成凝胶
E. 具有Tynclall现象
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