影响中速磨工作的主要因素是什么?
参考答案:
1、转速;
2、通风量;
3、风环气流速度;
4、研磨压力;
5、燃料性质。
建设行政主管部门应当自收到申请之日起()日内,对符合条件的申请颁发施工许可证。
A.20
B.15
C.25
D.30
How is the quartz heater different from other types of heaters A. It heats only the objects in a room. B. It is lighter in weight. C. It heats the room quicker. D. It is more common.