once detected smoke, immediately through a built-in dedicated IC driver circuit and an external piezoelectric transducer output alarm sound, so that people know at an early stage the fire, the fire extinguished
大圣杰锅是
2023-12-22 11:08
石英石为什么会是黄色的
Abstract: This paper reviewed the high Curie temperature piezoelectric materials, including tungsten ponze, bismuth layer structured, Perovskite types piezoelectric ceramics and corundum structure ceramics. The research studies on the...
Part I: theory, J. Acoust. Soc. Am. 90 (1991), pp. 2799–2807. Full Text via CrossRef | View Record in Scopus | Cited By in Scopus (26)(是参考文献吧?)。而对于分散的点反射体,准确测量其回声...