空调器选择强冷或弱冷，是通过改变室内（），改变排风量来实现的。
参考答案：风机转速
河姆渡居民住着__________的房子，半坡原始居民住着__________的房子。
Susan was expecting her favourite singers,but to her disappointment, appeared . [ ]
A. some
B. none
C. everyone
D. no one
