The working characteristics of heated negative pole power source of intervallic heat electricgun are introduced in this paper.The method of heated power's indirect test is advanced.

介绍间热式电子枪阴极加热电源的工作特点，提出对加热功率进行间接检测的方法。

Double Rollers Crusher is used to crush clunch and partial shales for brick enterprises. It has two rollers to circumrotate in reverse. The clunch between rollers are crushed by extrusion.

双辊破碎机普遍用于粘土和合料瓦的破碎设备，它有两个工作辊子作相反方向旋转，辊子间的粘土受到挤压而破碎。