单晶炉炉室真空密闭性能是衡量单晶炉设备性能好坏的重要因素。
The obturation of vacuum in the crystal grower is one of the most important factors to judge the equipment capability.
这种风扇是生产工地，炉室，焊接摊位，仓库，钻机，堆料场等场所的理想选择。
This fan is ideal for manufacturing areas, furnace rooms, welding booths, warehouses, drilling RIGS, stockyards etc.
然后根据压力的不同对炉室进行了分类。最后详细论述了抽真空充气系统的综合方法及工作原理。
Then, the furnace hearths are classified according to pressure, with their evacuating charging systems and its working principle discussed in detail.
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