sealed instrument

1. In this paper, the liquid level measurement of sealed air-condition compressor is introduced and an ultrasonic testing system based on virtual instrument is developed.
   文章介绍了对封闭式空调压缩机的液位测量，研发了基于虚拟仪器技术的超声波检测系统。
2. Spectral response characteristics of transmission-mode GaAs photocathode after high-temperature activation, low-temperature activation and indium sealed into intensifier are measured by use of the homemade prototype of spectral response measurement instrument.
   利用自行研制的光谱响应测试仪工程化样机，对透射式GaAs光电阴极在高温激活结束、低温激活结束以及铟封成管后的光谱响应特性进行了测试。

noun

1. a contract that is signed and has the (wax) seal of the signer attached

   Synonym:    contract under sealspecial contract