焦化加热炉的特点？
参考答案：
热传递速度快；
高流速短停留；
压力降小；
热分配合理。
— Tom prefers ______ to ______.
— Let's ask him to take part in our dancing club. [ ]
A. to sing; dance
B. to dance; sing
C. singing; dancing
D. dancing; singing
A．asthmatics logic unit and controller
B．arithmetic logic unit and memory
C．memory and controller
D．controller and storage
