甲苯苯环上的1个氢原子被含3个碳原子的烷基取代,可能得到的一元取代物有()。
A、三种;
B、四种;
C、五种;
D、六种。
参考答案:D
根据句意及首字母补全单词,使句意完整。
1. Jenny, would you like to make a fruit s_________ for me ?
2. Kids! Don't m_________ water and milk up!
3. My mother cut some s_________ of the watermelon for my father.
4. Do you know "sauce" is an u_________ noun?
5. Be careful! Don't p_________ cola on your books.
6. They looked for the boy here and there, and f_________ they found him in a corner.
7. You must read the i_________ before you take the medicine.
8. Li Lei doesn't like milk, but he likes y_________.
9. I'd like a c_________ of tea, please.
10. S_________ is a kind of food. It's made up with two slices of bread and some meat.
张师傅从一块长4分米,宽3分米的长方形铁皮中,剪下一个面积最大的半圆,剩下部份铁皮的面积是______平方分米.