问题
不定项选择题
下列高聚物必须是由两种单体缩聚而成的是[ ]
A．
B．
C．
D．
答案
CD
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下列高聚物必须是由两种单体缩聚而成的是[ ]
A．
B．
C．
D．
CD
| 送单词回家。选词填空。 | |
2. I am going to buy special for the Christmas tree. 3. We our friends and family to our house. 4. My friends gifts for us. We our friends and family gifts, too. 5. Lynn gives the gift to Li Ming and says: " it, please." |