热力管网热补偿采用管路伸缩器一般外形为U形与π形。
参考答案：对
用括号中所给词的适当形式填空。
1.1 want two________(pear).
2. He________(like) salad very much.
3. Do you like________(broccoli)?
4.The little boy ________( not like) French fries.
5.—________(do) he like apples?
—Yes, he________(do).
抗D可通过____、____或____产生。
