密封放射源
Sealed source
Shielded source
Sealed radioactive capsule
sealed radioactive sources
牦牛放牧率
KeywordStocking rate for yak
Yaks stocking rate
stocking rate for yaks
毛细管快放电装置
capillary fast discharge setup
脉宽调制放大器
pulse width modulation amplifier
amplifier of pulse-width modulation
脉冲张弛放大器
pulse relaxation amplifier