由于调速系统采用了PD调节器才实现无静差调速。（）
参考答案：错
Mike does his homework because he wants to watch the game on TV.
A. quickly B. slowly C. happily
A．新鲜大白菜会慢慢变干
B．冰棒刚从冰箱中取出时冒“白气”
C．在皮肤上擦酒精会感到凉
D．水壶中的水烧开后冒“白气”
