GB/T 11312-1989
Test methods for SAW properties of piezoelectric ceramics and crystals 压电陶瓷材料和压电晶体声表面波性能测试方法 |
GB/T 11299.8-1989
Methods of measuremant for radio equipment used in satellite earth stations--Part 2:Measurements for sub-systems--Section four:Up and down converters 卫星通信地球站无线电设备测量方法 第二部分:分系统测量 第四节:上变频器和下变频器 |
GB/T 11320-1989
Test methods for the properties of piezoelectric ceramics--Material with the low mechanical quality factor 压电陶瓷材料性能测试方法 低机械品质因数压电陶瓷材料性能的测试 |
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