单元制锅炉多采用（）停炉。
A.滑参数
B.定参数
C.紧急
D.故障
参考答案：A
1千克苹果的价钱是4.9元，妈妈买2.5千克苹果花了多少钱？
—What's the matter, madam?
—_________ [ ]
A. I am looking for some vegetables.
B. How much are the tomatoes？
C. Which one is your bag?
D. I can't find my son's address.
