下列说法正确的是
| A．胶体粒子的直径很小可以透过滤纸，因此可以用过滤的方法分离胶体和溶液 |
| B．布朗运动不是胶体特有的性质 |
| C．直径介于l-100nm之间的微粒称为胶体 |
| D．有的胶体带正电荷或者负电荷，在电压作用下可电泳 |
相关试题
Charles was alone at home, with_______ looking after him.
| A．someone | B．anyone | C．not one | D．no one |
It is often ______ that human beings are naturally equipped to speak.
| A．said | B．to say | C．saying | D．being said |
I can’t leave. She told me that I ______ stay here until she comes back.
| A．can | B．must | C．will | D．may |
—— Do you mind my opening the window? It’s a bit hot in here.
—— ______ , as a matter of fact
| A．Go ahead | B．Yes, my pleasure |
C．Yes, I do | D．Come on |
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