According to characteristics of chemical industry process of production, this paper details the pneumatic diaphragm valve, s choice on type, acting mode, specific property of flow and diameter size.
本文就气动薄膜调节阀类型、作用方式、流量特性和口径大小的选择，结合化工生产的特点作了较详细地阐述。
Transmission characteristics of Y type S type and "-" type SAW mass sensors are derived by P matrix representation.
应用P矩阵法推导了Y型、S型及“一”字型双声路声表面波质量传感器件的传输特性；
According to the distribution of potential, electron and hole in the BNRT at different stages, the mechanism inducing S-type negative resistance characteristics is explained.
根据BNRT不同工作状态下的内部电势、电子浓度和空穴浓度分布，解释了其S型负阻特性的产生机理。
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