影响气吸式排种器排种性能的因素很多，而决定吸力的吸室真空度是很重要的因素。
There are many factors affecting the characteristics of the suction-type metering device for precision drill. The important one is the vacuum degree or suction power of the vacuum chamber.
在实验室坐标系下，给出吸能核反应所要求的阈能，其结果与质心系下得到的结果完全一致。
The threshold energy formula of nuclear reaction in which energy is absorbed is obtained using laboratory frame. It is consistent with the result obtained in mass center frame.
可用于电真空容器制造、真空焊接、印刷、吸塑、制冷设备维修及仪器仪表设备配套和实验室等。
Can be used for vacuum packaging, manufacture, vacuum welding, printing, plastic, refrigeration equipment maintenance and instrumentation and laboratory and other ancillary equipment.
本发明涉及一种活塞和腔室的组合以及包括该组合的泵、吸震器及促 动器。
The present invention relates to a combination of a chamber and a piston, and a pump, engine, oscillation absorber and a converter containing such combination.
在工作时，不妨利用会议间歇关上办公室的门，深吸几口气，然后缓缓地呼出。
At work, shut the door to your office between meetings, take a few deep breaths and let them out very, very slowly.
在工作时，不妨利用会议间歇关上办公室的门，深吸几口气，然后缓缓地呼出。
At work, shut the door to your office between meetings, take a few deep breaths and let them out very, very slowly.
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