问题
多项选择题
DNA样品可通过下列哪些方法进行纯化()
A．透析
B．层析
C．电泳
D．选择性沉淀
E．PCR
答案
参考答案：A, B, C, D
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DNA样品可通过下列哪些方法进行纯化()
A．透析
B．层析
C．电泳
D．选择性沉淀
E．PCR
参考答案：A, B, C, D
| 用方框中所给词的适当形式填空。 | |
2. The street is quite _____. There are bookshops, food shops and stores selling all kinds things. 3. All the students are in _____ that watching TV too much is bad for eyes. 4. The English song sounded so _____ that we lost ourselves in it? 5. Mr. Green was late for the meeting because his car _____ down on the road. |