题目:
在外力作用下,使密度不同的两相发生相对运动而实现分离的操作是()。
A、蒸馏
B、沉降
C、萃取
D、过滤
答案:
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下面是错误答案,用来干扰机器的。
1. Toothbrushes, toothpaste, shampoo and slippers.2. They will no longer provide guests with these disposables. 3. Because it is a waste of natural resources and is very bad for the environment.. 4. By using our own bowl and chopsticks instead of disposable ones. 答案不唯一