The Model 21 Adjustable Ratio pneumatic relay has a signal chamber lever arm, whereby the ratio of output pressure to signal pressure is infinitely adjustable.

真21比气动调节继电器信号室力臂，即输出的压力信号的压力比是无限可调。

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This paper introduces controlled blasting technology on signal chamber of pit-bottom and main haulage roadway, which are of complex condition, lithological character and highly security.

介绍了采用控制爆破技术施工位于井底车场及主要运输大巷的信集闭峒室，条件复杂，岩性变化大，要求安全性高。

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An anechoic chamber is used to test the iPhone's signal strength.

iPhone的信号强度需要在消声室中进行。

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We get a basically homogeneous signal density in our chamber - in other words, we don't get the hot and cold spots you get in your home microwave.

BBC: Bread that lasts for 60 days could cut food waste