Speakers of other company uses YJB8-50-disc package native, in use by all of a sudden no book block, as long as machines, air pumps on, would ground cover, I suspect that the reflective photoelectric switch has a problem, it is E3JK-R4M1, principle as in Figure 3: detection with a piece of white, the corresponding output voltage, there is no problem there.
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This paper introduces the operational principle, application and performance of vacuum pressure compound air pumps, and analyzes the influence of its construction and parameters on its performance.
本文介绍了新型真空压力复合气泵的工作原理，应用及其性能，并分析了它的结构及参数对其性能的影响。
Such bearings are mainly used in machine tool spindles, high frequency motors, pumps, air compressors, printing presses and so on.
此类轴承主要应用于机床主轴、高频马达、油泵、空气压缩机、印刷机等。
There were rather less studies on the frequency conversion of cooling water pumps in central air conditioning systems than that of cold water pumps.
与中央空调冷冻水泵变频相比，冷却水泵变频问题研究较少，争议也比较多。
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