停炉过程中的最低风量为总风量的（）以上。
A.25%
B.30%
C.40%
D.50%
参考答案：B
Although they plant trees in this area every year, the tops of some hills are still _____. [ ]
A. blank
B. bare
C. solid
D. rare
国家规定，正常情况下，我国人均日消费蔬菜量不少于多少公斤？
