超声波换能器技术规格书
Ultrasonic transducers technical specification
1.产品名称：超声波换能器: Product name: ultrasonic transducers
2.产品型号：WK-21D type of the products: WK-21D
3.用途：超声波液体流量探测use: ultrasonic liquid flow detection
4.性能参数：performance parameters:
5.外观尺寸：Dimension:
